Dust and clean the walls. For most surfaces, use a towel or a vacuum cleaner. When painting a bathroom or kitchen, wash the walls with a solution of approximately three teaspoons of laundry detergent to one gallon of water. Professional painters hate washing walls. There are many good reasons for this. For one, they’re not in the business of washing—they’re in the business of painting. For another, washing cuts into painting time, which cuts into their income. In short, do not expect your professional painter to wash down all of your walls. He is not being lazy; he is being practical. How to Clean Walls – Preparing Walls for Painting Thursday, May 25, 2017 By Christine @ theDIYdreamer 1 Comment A fresh coat of paint must be applied on a clean surface. Beginning at the top of wall and working your way down, use a sponge to apply the solution in a gentle. Again, scrub lightly, ideally in a circular motion, to minimize the risk of upsetting the paint. Masking tape can leave behind a sticky residue that’s hard to clean off. Plus, paint can cause the tape to buckle or get wavy, which lets paint run underneath it. To clean exterior painted walls, whether latex or oil-based, start by wetting the walls. Then, using a pump garden sprayer, lightly spray the walls with a mixture of half-cup Jomax, one cup of .