Tannin Stain Remover is a low pH, water based spot remover. It is effective against stains from food, coffee, tea, rust, blood, oxidized organic residues and also contains a specific grease removing agent to remove oily soils. In addition, Tannin Spot Remover will not brown carpeting as alkaline based spotters can. Ideal for carpets and upholstery found in hotels, schools, offices, airports, restaurants, etc. Fresh floral scent.