How to Pressure Wash a House Mildew [2023 Updated]

If you’ve noticed mildew and grime building up on the exterior of your house, you’re likely looking for an effective solution to remove it. Pressure washing is a fantastic way to tackle this problem, but it’s important to do it right to ensure you don’t damage your home.

How to Pressure Wash a House Mildew? To pressure wash mildew from a house, first, apply a mixture of bleach and water to the affected areas. Allow it to sit for 10-15 minutes, then pressure wash with a 25-degree nozzle, keeping the pressure between 1500-2000 PSI. Rinse thoroughly with water.

In this blog, we’ll take you through the step-by-step process of pressure washing a house to remove mildew and other unsightly substances, leaving your home looking fresh and clean. So let’s get started!

Preparing Your House for Pressure Washing

Preparing Your House for Pressure Washing

If you have mildew on your house, take the right steps to prepare your house before pressure washing to ensure that the mildew is completely removed and doesn’t come back. Here is a look at some of the key steps you should take to prepare your house for pressure washing and remove mildew effectively.

Clearing the surrounding area

When pressure washing a house to remove mildew, clear the surrounding area before starting the job. This includes removing any objects or debris that could potentially get in the way, such as outdoor furniture or children’s toys. It’s a good idea to cover any nearby plants or landscaping to protect them from the high pressure water.

By clearing the surrounding area, you can ensure a safe and effective pressure washing experience without causing any unnecessary damage or obstacles.

Closing windows and doors

When pressure washing a house to remove mildew, prepare properly. One crucial step is to close all windows and doors to prevent water and cleaning solution from entering your home. This also helps to keep the pressure washing concentrated on the exterior surfaces of your house, which will maximize its effectiveness.

By taking the time to properly prepare your home for pressure washing, you can ensure that the process is safe, effective, and efficient.

Protecting delicate plants and outdoor furniture

When pressure washing a house to remove mildew, take steps to protect delicate plants and outdoor furniture. This can be achieved by covering them with plastic sheeting or moving them to a safe location. Failure to protect these items can result in damage or destruction, so it’s worth taking the time to ensure they are well-protected before beginning the pressure washing process.

Disconnecting electrical outlets and covering them

When pressure washing a house to remove mildew, take precautions to protect electrical outlets from water damage. To do so, it is recommended to disconnect all electrical outlets and cover them with waterproof materials before beginning the pressure washing process. This will help to prevent any potential electrical hazards or damage to your home’s electrical system.

Choosing the Right Detergent

Choosing the Right Detergent

When it comes to pressure washing your house, choosing the right detergent can make a big difference in the results you achieve. While water alone may remove some mildew and dirt, it’s often not enough to completely eliminate the problem. That’s where detergents come in, as they can help break down and remove stubborn mildew and other grime from your home’s exterior surfaces.

Not all detergents are created equal, and selecting the wrong one could damage your home’s siding, trim, or other materials. Following are some key considerations to keep in mind when choosing a detergent for pressure washing your house’s mildew, so you can achieve a clean, like-new finish without causing any harm.

Mildew-specific cleaning solutions

When pressure washing a house to remove mildew, choose the right cleaning solution. Mildew-specific cleaning solutions are available in the market and are effective in removing mildew from surfaces. These solutions contain specialized ingredients that target mildew and prevent its regrowth.

It is recommended to read the instructions carefully before using any cleaning solution and wear protective gear such as gloves and goggles. Home remedies like vinegar and bleach should be avoided as they can damage the surface and may not be as effective in removing mildew.

Eco-friendly options

When it comes to choosing the right detergent for washing house mildew with a pressure washer, opting for eco-friendly options is not only beneficial for the environment but also for your health. Here are some considerations and eco-friendly alternatives to consider:

  • Biodegradable Detergents: Look for detergents that are labeled as biodegradable. These detergents are formulated to break down naturally in the environment, reducing their impact on water sources and ecosystems. They are typically made from plant-based ingredients.
  • Oxygen-Based Cleaners: Oxygen-based cleaners are another eco-friendly option. They use oxygen bleach as the active ingredient, which is derived from natural sources like hydrogen peroxide. These cleaners are effective in removing mildew and stains without the use of harsh chemicals.
  • Citrus-Based Cleaners: Citrus-based cleaners are derived from citrus fruits such as oranges and lemons. They contain natural enzymes and acids that help break down dirt, grime, and mildew. These cleaners are biodegradable and leave a fresh citrus scent behind.

Proper dilution and application

The proper dilution and application of detergent is essential when pressure washing a house with mildew. Follow the manufacturer’s instructions for dilution ratios to ensure the detergent is effective without causing damage to the surfaces being cleaned.

The detergent should be applied evenly and allowed to sit on the surface for the recommended amount of time before being rinsed off with the pressure washer. Proper dilution and application will help ensure a successful and safe pressure washing experience.

Step by Step Guide: Pressure Washing House Mildew

Step by Step Guide: Pressure Washing House Mildew

Here is the process of pressure washing your house to get rid of mildew, from gathering the necessary tools and equipment to safely and effectively using your pressure washer. So, let’s get started!

Inspecting your house for mildew

Inspecting your house for mildew is an essential step before pressure washing. You can easily identify mildew by looking for black or dark green spots on the exterior walls of your house. Check for areas that are shaded or where moisture tends to accumulate, such as under eaves, around gutters, and near downspouts.

It’s crucial to identify and remove any mildew before pressure washing, as it can spread and cause health problems. If you notice signs of mildew, it’s recommended to use a mildew remover solution and let it sit for several minutes before rinsing it off with a hose.

Setting up the pressure washer

Setting up the pressure washer is the first step in pressure washing house mildew. It involves choosing the right nozzle for the job, connecting the water source and turning on the machine. Ensure that the pressure washer is properly grounded and that all connections are secure before use. It is recommended to wear appropriate safety gear such as eye and ear protection, as well as protective clothing to avoid injuries.

Applying detergent to affected areas

The process of pressure washing a house mildew involves applying detergent to affected areas. This step is crucial in breaking down and removing mildew from the surface of the house. Choose the right type of detergent and to apply it evenly to ensure the best results.

Once the detergent is applied, it should be left to sit for a few minutes before rinsing it off with a pressure washer. This will ensure that the mildew is completely removed and that the surface of the house is left clean and looking like new.

Pressure washing the house

Pressure washing is an effective way to remove dirt, grime, and mildew from the exterior of a house. Before pressure washing, inspect the surface and identify any areas that may need special attention. Choose the right pressure washer and nozzle for the job, as using too much pressure can damage the surface. It is recommended to start pressure washing from the top of the house and work your way down, using a detergent solution to help break down the mildew.

Rinse thoroughly after pressure washing, and take precautions to protect nearby plants and surfaces. Regular pressure washing can help keep your home looking clean and well-maintained.

Rinsing the house thoroughly

The process of pressure washing a house to remove mildew includes rinsing the house thoroughly. This step is crucial as it ensures that all the loose dirt and grime are removed before applying any cleaning solution or detergent.

By using a wide-angle spray nozzle, you can cover a larger area and rinse the surface effectively. Avoid holding the nozzle too close to the surface as it can cause damage to the siding or paint. By thoroughly rinsing the house, you can prepare the surface for the next step of applying a cleaning solution to remove mildew effectively.

Inspecting the house for remaining mildew

When pressure washing a house to remove mildew, inspect the house before starting to ensure that all mildew is identified and addressed. This involves a thorough visual inspection of the exterior surfaces, paying special attention to areas where moisture may accumulate.

If any mildew is left behind, it can quickly spread and re-contaminate the surface, making the pressure washing process ineffective. Inspecting the house for remaining mildew is a crucial step in achieving a successful pressure washing outcome.

Preventing Future Mildew Growth

Preventing Future Mildew Growth

Below are some strategies you can use to reduce the likelihood of mildew growth and keep your home looking its best. By following these tips, you can not only remove existing mildew but also prevent it from becoming a recurring problem in the future. So, let’s dive in and discover how to keep your home mildew-free!

Regular maintenance and cleaning

Regular maintenance and cleaning of your home’s exterior is crucial in preventing future mildew growth. This involves a regular cleaning schedule and keeping an eye out for any signs of mildew or other growth.

Some simple steps to take include keeping gutters clean, trimming trees and bushes away from the house, and washing the siding and other surfaces with a mildewcide solution. By taking these preventive measures, you can avoid the need for costly and time-consuming pressure washing in the future.

Ensuring proper ventilation

Proper ventilation is crucial in preventing mildew growth on your house after pressure washing. Without adequate ventilation, moisture can become trapped and create the perfect environment for mildew to thrive. To ensure proper ventilation, make sure all vents and openings are clear of debris and functioning properly.

Consider using fans or dehumidifiers to help remove excess moisture from the air. By taking these steps, you can help prevent future mildew growth on your house and keep it looking clean and fresh for longer.

Applying mildew-resistant paint or sealant

Using a mildew-resistant paint or sealant can be an effective solution to prevent future mildew growth on a house after pressure washing. These products are designed to resist the growth of mildew, mold, and other fungi, and can be applied to various surfaces, including walls, ceilings, and floors.

Follow the manufacturer’s instructions carefully and choose the right product for the surface being painted or sealed. Proper surface preparation is essential for the paint or sealant to adhere properly and provide maximum protection against mildew growth.

Safety Precautions

Following are some essential safety precautions that you should take before, during, and after pressure washing your house to ensure that you and your property remain safe. By following these safety guidelines, you can confidently and safely clean your home’s exterior without risking any injury or damage.

Personal protective equipment (PPE)

Personal protective equipment (PPE) refers to the safety gear that should be worn while pressure washing a house to protect oneself from potential harm. This equipment includes eye and ear protection, gloves, non-slip shoes, and clothing that covers the skin.

Using PPE can prevent injuries from flying debris, high-pressure water, and chemicals used in the cleaning process. It is essential to wear PPE to ensure safety while pressure washing a house with mildew.

Choosing the right pressure washer

When choosing the right pressure washer for removing mildew from your house, there are a few factors to consider. First, you’ll want to select a pressure washer with enough power to effectively remove the mildew, but not so much power that it damages your siding or other surfaces. Look for a pressure washer with a pressure output of around 2,000 to 3,000 psi.

You’ll also want to consider the type of pressure washer to use. Electric pressure washers are generally more affordable and better suited for smaller jobs, while gas-powered pressure washers are more powerful and better suited for larger projects.

Pay attention to the features of the pressure washer you select. Look for a model with adjustable pressure settings and different nozzle options, as well as a detergent tank that can be used to apply a cleaning solution specifically designed to remove mildew. By choosing the right pressure washer and using it properly, you can safely and effectively remove mildew from your house without causing damage to your property.

Safeguarding your property and surrounding areas

When pressure washing your house to remove mildew, it’s crucial to take proper safety precautions to safeguard your property and surrounding areas. This involves covering nearby plants and furniture, securing loose items, wearing protective gear such as goggles and gloves, and avoiding high-pressure settings that can damage surfaces.

By taking these measures, you can ensure a successful and safe pressure washing experience.


Pressure washing a house with mildew requires pre-treatment with a bleach-water solution. Apply the mixture to the affected areas and wait for 10-15 minutes before using a pressure washer with a 25-degree nozzle, maintaining 1500-2000 PSI pressure. Finish by thoroughly rinsing the surface with clean water.

As we wrap up our discussion on how to pressure wash a house mildew, it’s important to remember the many benefits of keeping your home clean and free of mildew. Not only does a clean house make for a more pleasant living environment, but it also promotes a healthier home by reducing the presence of harmful bacteria and allergens.

To maintain a clean and mildew-free home, it’s important to follow some simple maintenance tips. Regularly cleaning your home’s exterior with a pressure washer can prevent the growth of mildew and other harmful organisms. Be sure to regularly inspect and clean your home’s gutters, downspouts, and other drainage systems to prevent water buildup and potential water damage.

By following these simple maintenance tips and regularly pressure washing your home’s exterior, you can enjoy the many benefits of a clean and healthy living environment for years to come. So why wait? Get started today and take the first step towards a cleaner, healthier home.

Frequently Asked Questions (How to Pressure Wash a House Mildew)

Does pressure washing remove mildew?

Pressure washing can effectively remove mildew from surfaces. The high-pressure water stream generated by the pressure washer helps to dislodge and remove the mildew growth.

However, it’s important to note that pressure washing alone may not completely eliminate the underlying cause of mildew, such as moisture or lack of ventilation. It’s advisable to address the root cause to prevent future mildew growth.

What is the best pressure washer cleaner for mildew?

When dealing with mildew on surfaces, using a pressure washer cleaner specifically formulated to combat mildew is recommended. Look for cleaners that contain ingredients like sodium hypochlorite or oxygen bleach, as they are effective in killing and removing mildew.

It’s essential to follow the manufacturer’s instructions and dilution ratios for optimal results and to ensure the safety of both the surface and the user.

How do you clean mold off siding with a pressure washer?

To clean mold off siding using a pressure washer, start by preparing the area. Remove any loose debris or dirt from the surface. Next, apply a suitable detergent or mold cleaner to the siding, focusing on the affected areas. Allow the cleaner to sit for a few minutes to penetrate the mold.

Then, using the pressure washer with a wide-angle or low-pressure nozzle, rinse the siding from the bottom up, working in small sections. Keep the nozzle at a downward angle and maintain a safe distance to avoid damaging the siding.

Will a power washer remove mildew from siding?

Yes, a power washer can effectively remove mildew from siding. The high-pressure water stream generated by a power washer helps to dislodge and wash away the mildew growth from the surface. It’s important to use the appropriate pressure and nozzle to prevent any damage to the siding.

Additionally, using a mildew cleaner or detergent specifically designed for use with power washers can enhance the cleaning process and ensure better results.

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Andrew Joseph
Andrew Joseph

Introducing Andrew Joseph, a pressure washing expert with 15 years of experience in residential, commercial, and industrial projects. Andrew shares his vast knowledge through insightful blog posts, offering valuable tips and best practices for optimal cleaning results. His passion for educating others, combined with his extensive expertise, makes Andrew an indispensable resource for those looking to master the art of pressure washing.