Urine-Off is a bio-enzyme urine odour and stain remover. Removes both old and fresh urine stains and odours permanently, from virtually any surface. Can help remove and prevent uric salts build-ups in litter trays, cage bases and on shelves. Apply and let dry then wipe with a damp cloth or rinse (this step is not necessary but I prefer to do it). Heavy build up may require several applications. This product is non-toxic. 4oz (118ml)