All urine, both animal and human consists of urea and uric acid crystals. Some general cleaners can remove the water-soluble components of urine (urea) but leave behind the non-soluble uric acid crystals that retain the odour and stain. These crystals attach to surfaces and are very difficult to dislodge, especially when exposed to humidity or dampness which will trigger the dormant crystals thereby bringing back the odour. Enzyme Wizard Urine Stain & Odour Remover enzymatic formula penetrates the uric acid crystals while removing the urea components, eliminating both the urine stain AND the odour for good. Containing no harsh or hazardous ingredients, Enzyme Wizard Urine Stain & Odour Remover is soap free, biodegradable and environmentally friendly and being non-toxic, non-bacterial and non-hazardous is safe to use around humans and animals. Enzyme Wizard Urine Stain & Odour Remover is simple to use and can be used to treat both new and old stains effectively. Available in 2 sizes, 1L and 5L.