WEE AWAY Refresh for Kitty Litter is a powerful odor remover specially designed to eliminate litter box odors. WEE AWAY Refresh for Kitty Litter natural eco-friendly enzymes and odor-eating bacteria destroy the source of litter box odors, unlike other products that simply attempt to mask them! WEE AWAY Refresh for Kitty Litter even gets the odors out of plastic litter boxes.