The enzymes in Urine-Off are specifically developed and combined to "eat" the uric acid crystals, in addition to removing the other components of urine. Effectively removing these crystals is what distinguishes Urine-Off from the rest of the products we've tested. With the source of the odor AND the stain removed, the problem is solved. Urine-Off has a pleasant citrus fragrance and even that disappears when the product dries.