Chocolate milk splatters create a twofold problem that includes a sour protein stain and a chocolate stain. Walls with flat paint are infamous for not being as easy to clean as their semi- and high-gloss counterparts. Successful removal of a chocolate milk stain on your wall depends upon prompt removal. Although the stain can still be removed after the milk dries, it will demand the use of more elbow grease, and you risk rubbing off the paint.
Blot the chocolate milk stain on the wall with paper towels to remove as much as possible.
Dampen a sponge with water and squeeze out the excess. Sprinkle baking soda onto the sponge and gently rub the stained wall area.
Mix 1 cup ammonia with 1 gallon cool water. Using cool water reduces smelly fumes from the ammonia. Wear rubber gloves to protect skin from dryness.
Soak the sponge in the ammonia solution and wring out the extra moisture. Wash the wall at the site of the chocolate milk stain to remove any remaining stain and baking soda residue. Wipe the wall dry with paper towels and allow to air dry.
Treat any last trace of chocolate milk stain with a magic stain-erasing sponge. Dampen the sponge and gently wipe to remove the stain.
Wipe off a chocolate milk stain on flat paint as soon as it occurs to avoid the stain settling into the paint. Be gentle when wiping or sponging a wall to avoid removing paint along with the stain.
Old, set-in stains can be difficult to remove from flat paint without altering the appearance of your wall. Keep a small can of matching paint to cover up stained areas that cannot be washed off.