Mix one tablespoon of clean household ammonia with one-half cup of water.
Use hydrogen peroxide or sodium perborate (present in Snowy or Clorox II).DO NOT use chlorine bleach.
Mix one teaspoonful of a colorless, mild detergent or dishwashing liquid in a cup of lukewarm water.
Volatile dry spotter or a commercial spotter such as Thoro, Energize, K2R. Use in small amounts...can be harmful in sizing, backings or stuffing material.DO NOT use gasoline, lighter fluid or carbon tetrachloride.
Paint, oil and grease remover; available in hardware stores. Use extremely small amounts with extreme caution!