Why the stain that I removed, resurface, yellowish/brownish? Why the stain that I removed, resurface, yellowish/brownish PetPeePee Customers: ask this question rather often:? My name is, Meir Martin I am the owner and the inventor of PetPeePee system, cleaning process to remove dog and cat urine odor from: Oriental rug and curtains. Since 1991 I [...]