Before painting, it is important to clean the walls to ensure that the paint adheres properly and to prevent dust from getting trapped in the new paint. Here are some tips on what to wash walls with before painting:

• Warm water and mild soap: In most cases, a solution of warm water and mild soap is all you need to clean the walls before painting. Use a sponge or cloth to gently scrub the wall, starting from the base and working your way up. Rinse the wall with clean water and allow it to dry completely before painting.

• Trisodium phosphate (TSP): If the walls have accumulated oil or grease, or if there are stubborn spots that are not responding to warm water and soap, you can use TSP. Mix a small amount of TSP with warm water according to the manufacturers instructions, and use a sponge or cloth to gently scrub the wall. Rinse the wall with clean water and allow it to dry completely before painting.

• Baking soda: For stubborn stains, you can try using baking soda. Mix a quarter cup of baking soda with warm water to form a paste, and apply the paste to the stain with a clean cloth. Use a towel to dry the wall when youre finished and wait for a couple of hours before painting.

It is important to avoid over-wetting the walls when cleaning them, as this can cause damage to the wall or paint. Additionally, make sure to rinse the walls thoroughly with clean water and allow them to dry completely before painting.