Kotomoda Probiotic Pet Housing Cleaner Odors Remover 6.76oz. Shipped with USPS First Class Mail - enzyme-rich cleaner containing detergents and enzymes - key feature is removing cat marks is its ability to break open the protective biofilms of pathogenic bacteria, thus eliminating the cause of unpleasant smells - easily penetrates the most hard-to-reach places, effectively breaks down organic pollutions into harmless substances, including pet waste and leftover feed - destroys the very basis of the smell; the surfaces remain clean, and pets recognize neither their own, nor other animal’s scents