Enzymes will remove certain stains from all kinds of materials. You can
buy pepsin, the best known of the enzymes, at the drug store. It softens
stains containing albumin (found in blood, gelatin, glues, certain
medicines, eggs, milk, and ice cream), so that they wash out in water
easily. Pepsin will soften these stains, even after they have been set
by heat or alcohol. First be sure there is no soap or other alkali on
the stain, or the enzyme will not react. Then dampen the stain with
lukewarm water and sprinkle with pepsin powder. Let it stand for half an
hour, keeping the spot damp. Or mix the pepsin with water (2 teaspoons
to 1 pint lukewarm water) and sponge the stain with it. Sponge or rinse
well with water.