The stone that foams! The universal stone is multi purpose and multi surface cleaner made from soak flakes, green soap, vegetable oils, glycerine, clay and natural lemon oils. It is safe for use on stainless steel, silver, gold, ceramic, marble and more. It is non toxic, fully biodegradable, earth friendly, phosphate free, toxin and acid free. Gentle on skin, the universal stone is allergy and asthma tested, and safe for children and pets.