These stains differ so in composition that it is impossible to give
methods which will be successful in all cases. If the color of the cloth
is not destroyed but only changed, it may be restored. Normal human
urine is usually acid, as is also that of all meat-eating animals.
Therefore sponge such stains with a weak ammonia or soda solution. (See
Acids, p. 10.) If the stain is alkaline, sponge with lemon juice or
vinegar. (See Alkalies, p. 11.)
Warm water followed by salt and water.—Sponge with warm water. Warm salt
water may be used (about ½ cup salt to 1 quart water). Apply and let
stand 15 minutes; then sponge with clear water.
Hydrogen peroxide or sodium perborate.—Apply a few drops of hydrogen
peroxide (see p. 7) or sponge with a mixture of 1 level teaspoon sodium
perborate to 1 pint peroxide. Powdered sodium perborate may be sprinkled
on the dampened stain. Rinse thoroughly in water.