NATURES MIRACLE Advanced Formula Stain and Odor Remover is strong enough for your pets worst messes, especially those that are old or set-in. Our advanced formula works to remove severe and stubborn organic stains and odorsincluding overlooked accidents, deep-set dirt and grass, smoke, food, stomach upsets, blood and more. The bio-enzymatic cleaning capabilities of Natures Miracle Advanced Formula Stain and Odor Remover makes it one of the best performing products in the pet industry as it is capable of removing stains and odors even where other products have failed. Natures Miracle Advanced Formula Stain and Odor Remover may be used for stubborn stains and odors caused by dogs and other pets on carpets, hard surfaces, clothing, kennels, and carriers. How it Works: Natures Miracle Advanced Formula Stain and Odor Remover works quickly to get at the source of even the most stubborn stains and odors by actually surrounding organic stain and odor matter. This breakdown works to eliminate any stain or odor rather than simply masking them as other products may do. The process works best when allowed to dry naturally (sometimes taking up to two weeks) and it is especially important that the product reach all of the affected areas- including carpet pads and subfloors where stains and odors can spread far beyond what is visible.