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First, check the label on your fabric to ensure that it is washable. If it is, you should by able to remove the yellow stains by soaking the article in warm water with a few denture tablets overnight, then launder as usual. Or, combine a tablespoon each of white vinegar, salt, and water softener with one pint of water, dip area up and down in solution, rinse well and launder. Or, rub white non-gel toothpaste into the spot and wash in cold water. If the fabric is unwashable, you will need to have it dry-cleaned.