If the spot persists , use an enzyme presoak .
If the spot persists , soak the item in a gallon of water to which you 've added a cup of ammonia ( or use bleach if the items are white ) .
If the spot persists , use an enzyme presoak , or soak the item in a gallon of water to which you 've added a cup of ammonia ( or use bleach if the items are white ) .