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How to Wash The Exterior Of Your Home Before Painting

If you are getting ready to paint the exterior of your home, you must clean the walls first. This will ensure that the paint goes on smoothly and looks great when finished.

This blog post will discuss how to clean your home’s exterior walls before painting. We will also talk about ways to clean different types of surfaces around your home, the supplies you’ll need, and provide other professional tips to help your DIY home painting project look amazing!

Why Do I Need To Clean Exterior Walls Before Painting?

Cleaning the exterior of your house is a dirty job, but it’s worth doing before painting. You might be tempted to skip this step and deal with chipping paint but removing the dirt and grime from your home’s exterior before painting.

The new coat will adhere better to your home’s siding better once the exterior of your home is cleaned.

This will help your DIY home painting project look better, but it also means that the paint will protect your home from moisture and UV light better for years to come.

It is essential to clean exterior walls before painting for a few reasons. First, you want to remove any dirt, dust, or debris that could be on the surface. This can cause the paint to look uneven when it is applied.

Second, you want to make sure that the paint will adhere properly to the surface by removing dirt and dust from the surface of your home.

If there are any oils or other substances on the wall, it can prevent the paint from sticking correctly once a fresh coat is applied.

Finally, cleaning the walls will also help remove any mildew or mold that may be present. This can ensure that your paint job lasts longer and looks better in the long run.

Now that we know why cleaning your home’s exterior is necessary, we should look at the different supplies you need to clean your exterior walls.

What Supplies Will You Need To Clean Exterior Walls?

If you want to paint the exterior of your home, you will need to do some prep work and clean the exterior of your home to ensure your project looks great.

Here are just a few tools that you should have on hand before you clean the exterior of your home before you start a DIY paint job:

  • Powerwasher: You will need a power washer to remove any dirt, dust, or debris from the surface of your walls. I recommend using a 2,500 – 3,000 PSI pressure washer to help clean the outside of your home. Be sure to read the instructions carefully before using a power washer. You don’t want to damage the siding on your home.
  • Mild Detergent: You will also need a mild detergent to help remove any oils or other substances on the surface of your walls. Be sure to choose a safe detergent for use on exterior surfaces.
  • Water: You will need water to mix with the mild detergent and rinse off the detergent after cleaning the surface of your walls. You can connect your pressure washer to a hose to help clean the outside of your home.
  • Stiff-Bristled Brush: You will need a stiff-bristled brush to help scrub any stubborn dirt, dust, or debris from the surface of your walls. Be sure to choose a safe brush for use on exterior surfaces.
  • Gloves & Protective Eyewear: You will need gloves and protective eyewear to protect your hands and eyes from the power washer and detergent. Eyewear is essential if you are power washing overhangs or areas above you since water will splash down on you, and you don’t want to get any water or cleaning chemicals in your eyes.

Once you have the supplies, you should start spraying down and wiping the sides of your home to remove dirt and dust.

This process should only take you a few hours, and you will want to let your home dry before you begin painting to ensure you don’t paint on siding with moisture on it.

How To Clean A House Exterior Before Painting

Now that you know why it is crucial to clean exterior walls and the supplies you need before painting, let’s discuss how to do it.

The first step is to pressure wash the entire surface. This will remove any dirt, dust, or debris on the wall. You can rent a pressure washer from your local home improvement store or hire a professional to do this for you.

As you pressure wash, pay special attention to corners around your roof and soffits since lots of dirt can accumulate in these areas. You should always move the spraying in a smooth side-to-side motion around the siding and trim work to make sure you hit as much dirt and dust as possible from your siding.

Also, be careful around windows and doors since pressure washers can damage windows and other areas of your home.

If high-pressure water does not cut the mustard, use a cleaning agent to help knock off stubborn dirt without using a lot of energy to physically clean your home’s siding.

Cleaning additives include TSP (trisodium salt), Oxi-Clean, or even Dawn soap. Mixing a small amount in a 5-gallon bucket with cold tap water will make an easy mix for exterior surfaces before rinsing off and painting.

Plus, this method is safe enough that you can apply this also to plants outside your home!

Once the surface has been pressure washed, you will need to scrub it with a brush if there is stubborn dirt or other debris from your wall before painting.

Typically, you only need to scrub areas of your home that have mildew on it or other dirt stuck on your home’s side. It would help if you did not have to scrub the entire home since this would take a lot of time and would not add much value to the overall project.

After the surface has been cleaned, you will need to let it dry completely before painting. This can take a few hours or even a day, depending on the weather conditions.

Once the surface is dry, you are ready to start painting the exterior of your home!

How To Clean Stucco House Exterior Before Painting

Stucco is a type of material used on the exterior of homes. It is made from cement, sand, and water.

Stucco is a very porous material, which means it can absorb paint well, so you will need to knock out dirt and dust wedged into the stucco’s nooks and crannies.

The first step in painting stucco is to pressure wash the entire surface. This will remove any dirt, dust, or debris on the wall.

I recommend using a light detergent when cleaning stucco before painting since the detergent will help you clean the surface without manually scrubbing.

I like to pressure wash stucco just like I would any other siding, and I always use a pressure washer with at least 2,500 – 3,000 PSI to ensure I can get pressured water into all areas of the stucco wall.

Since stucco is porous, you will need to give stucco more time to dry than other types of siding compared to wood or metal siding.

How To Remove Mildew From The Exterior Of Your Home

If you have mildew on the exterior of your home, it is essential to remove it before painting. Mildew can cause the paint not to adhere correctly and make the paint job look bad.

To remove mildew from your home, you will need to use a chemical with mildewcide or create a homemade mix of bleach and water. I recommend using a mixture of 10 parts water to 1 part bleach to avoid unwanted side effects of using too much bleach on a home’s siding.

If you use a bleach mixture, you will want to trim back vegetation around your home since bleach can kill plants and trees. Because of this, you should only use a bleach mixture in areas that need it, like in shady areas of your home or near lots of moisture.

Also, you will want to rinse off the sides of your home once you apply the bleach mixture to ensure it doesn’t dry and mixes with the paint that you apply to your home’s exterior.

After the area has been rinsed, you must let it dry completely before painting.

Cleaning Exterior Walls Before Painting

By following these simple steps for cleaning your home’s exterior before painting, you can avoid the hassle and added expense of having to repaint because of dirt or mildew buildup.

Use a pressure washer, detergent, and a soft-bristled brush to get your home looking its best before applying that new coat of paint.

Once you have cleaned your home’s exterior thoroughly, you can begin with prep work like scraping, sanding, and priming your side or trim work before painting!


Hi, I'm Chris. I'm a professional painter with over 10 years of experience. I want to show homeowners tips, guides, and advice to save them time and money when painting their own home. I know it can be daunting to take on a painting project yourself, but it doesn't have to be. With the right information and some guidance, you can easily paint your home and save money in the process.


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