Scrape off the dried puffy paint from the surface of the wall with the edge of a credit card. Remove as much of the paint as possible.
Add 1 teaspoon of dish washing detergent into a bowl. Add 1 tablespoon of white vinegar and 1 cup of warm water. Stir the ingredients together with a spoon.
Wet a clean cloth with the detergent and vinegar solution. Wring out the excess moisture.
Place the cloth over the remaining puffy paint stain on the wall. Hold it in place for three to five minutes to soften up the residue.
Wipe the softened residue with the soapy cloth to carefully remove as much of the stain as possible. Rinse the wall with a damp cloth.
Pour rubbing alcohol onto a clean sponge until it's damp. Dab at the remaining puffy paint stain to remove the pigment.
Rinse the surface of the wall with a damp cloth then blot it dry with another cloth.