Water.—If the material is washable, soak the spot in warm water, or if
it is a stubborn stain you may have to boil it. If the stain is known to
be casein glue, soak it in cold water.
Acetic acid.—For nonwashable materials, sponge the spot with water, then
with acetic acid (10-percent solution) or white vinegar. Rinse well.