How to Paint a Mural (with Pictures) - wikiHow
Oct 08, 2020·Check the wall over for signs of damage, difficult stains, and other issues you need to treat before you begin. Any debris on the wall will show up in your work. Mix about 3 US tbsp (44 mL) of a basic liquid laundry detergent or dish soap into a bucket of water, then scrub the wall with a rag. Let the wall dry before you start painting.