I have an older cat who suffers with anxiety - so sometimes nervously pees when he's stressed out. On beds! I've tried all kinds of stain & smell removal with vinegars & detergents - you name I have tried it. Never seems to get rid of that undetectable smell that he returns to for a quick nervous pee. I was so impressed with PetLab's Double Strength Urine Stain & Odour Remover - it smells lovely & absolutely removes stains (even really old ones) from fabrics, doonas, sheets & mattresses! I've happily re-ordered. Can't recommend PetLab's products highly enough.