Urine
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.