Fresh & Free Fabric Freshener + Flea Control doesn't just "mask" pet odors, it elminates odors in pet bedding, carpets, rugs, upholstered furniture and other areas frequented by pets - even the toughest odors sush as urine, feces and vomit. Plus, Fresh & Free Fabric Freshener + Flea Control kills flea eggs and larvae for up to 30 days. It contains Nylar, an insect growth regulator that stops flea larvae from becoming bitting adults. Fresh & Free Fabric Freshener + Flea Control doesnt control existing adult fleas. Rather, it causes a gradual reduction and elimination of the flea population by breaking the reproductive cycle. Regular use of an on-pet flea control product is also recommended to help keep fleas out of your home. Water-based, non-staining. Leaves a fresh, clean scent.