If you’re painting a wall with a matte finish, it’s important to keep the surface clean and free of dirt, dust, and other debris. Here are some tips on how to do this:

  1. Start by wiping down the surface with a dry cloth or paper towel. This will remove any built-up dirt and dust.
  2. Next, use a mild soap solution to clean the entire wall surface. Be sure to use plenty of soap because it can cause the paint to adhere better to the wall.
  3. Finally, use a vacuum cleaner or bucket to suck up all of the dirt and debris that has built up on the wall over time.