How To Clean Walls Before Painting? Step By Step Guide [Easy]

If you have decided to paint your walls using an HVLP paint sprayer for cabinets or any other home use sprayer then it is really important to clean your walls before painting. If your walls don’t look good or if they look dirty even the best furniture in the world would not look good in that room.

But, not everyone has the time of the world to spend on painting their own walls. But if decide to do it, at least do it well! No one wants to spend a lot of time on this and get bad results. That’s why it is really important to prepare your walls before painting them. That is an easy task but there are some steps you need to follow in order to do it the correct way.

Luckily for you, we have done this task a lot of times. And now down below we have written the guide and steps we follow in order to get the best results by doing this.

Check Condition

The first thing to do before deciding to whenever clean the walls or not is to check their condition. Not every wall needs to be cleaned. But its really recommended checking each one of them before starting to paint them. These tests are easy, and they will save you a lot of time in the long run.  For example, if your walls are dirty and not “ready” to be painted, then you will have to re-paint them or add some extra layers to make it look good.

That would consume you a lot of time and money as well. All of that could be avoided if you do a simple check on your walls.  There are a couple of tests you need to do.

Test One: For the first test you need a white cloth, the cloth should be white and dry of course.  Get the cloth and cover the part of the wall you want to spray. If the cloth doesn’t change its color or become “dirty” then you don’t need to wash your walls and you are ready to go. But if the color of the cloth changes then you need to wash the walls before starting to paint them.

Test two: This test will help you decide if you should use Trisodium Phosphate (TSP) or not

Savogran 10622...The Trisodium Phosphate or TSP is a powder that is used by many Professional decorators for cleaning solutions, and it is really effective and easy to use.  TSP is used to cut through different stains such as oil etc. Using a TSP on your wall will help you get rid of all the stains and dirt on your wall and leaves the surface ready to get painted.

There are many different TSP on the market, but the one I find the most effective and the one I use most is this one called “Savogran 10622 Trisodium Phosphate (TSP) 4.5lbs

I have used this product a lot of times and I get great results every time. You can use this for normal every-day stains but this also can be used for more “difficult’ stains such as smoke and many different stains.

Once you buy it you only have to mix an amount of powder with hot water and you are ready to use it to clean your walls.

One thing that you need to careful with this powder is the way on how you will store it. It is recommended to store is on a sealed plastic container( I do it too) because it will last longer if you keep it on your bathroom or somewhere else it may start to clump.

As I have mentioned it earlier there are walls that you don’t need to clean them and you can just start to paint them. But I usually clean all the walls even if they are good. This and a high-quality HVLP paint sprayer help me get a really good finish quality.


I use TSP for almost every room on my home ( or the building I have to paint).

Kitchen: Kitchen’s are really hard to re-paint. Cooking there every day can really damage the paint on walls. And if you just decide to re-paint the walls without cleaning you will get a horrible finish. Therefore it is recommended to clean the walls with TSP before starting to paint.
Children’s Room: This is where I use this product the most. Kids are not that careful when it comes to keeping the walls clean. They hang different stickers, picture frame and touch the wall with dirty hands a lot of times during the day. Even if the children’s room pass the test one it is recommended to clean it with TSP.


TSP Alternative

If for some reason you don’t want to use TSP then you can use hot soapy water as an alternative. The process is really easy but it takes more time.

You just have to grab a cloth and start washing. But as we mentioned it before, different rooms such as the kitchen has a lot of stains and it’s harder to get rid of them. After you are done it’s recommended to wash the walls with just hot water by wiping it over the wall.

You have to apply the soap directly to the stain and then use a cloth to clean the wall. You have to keep going until the stain has gone. Depending on what stain it is . this can take you a lot of time and energy, but you really have to do this if you want to get a high-quality finish.

Final Words

This is the guide you need to follow in order to get a better finish quality. I highly recommend you to use TSP before painting even if the wall passes the first test. That’s all you need to do before painting a wall, of course, if you know how to use a paint sprayer. If you don’t then I highly recommend you to check our other posts on our blog that will help you get better at painting and using paint sprayers.

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