Earthpawz's Eco-Tabs are effective on all kinds of pet stains and odors in carpets, the company reports. Simply add two Eco-Tabs to 32 oz. of water, spray the spot and blot. The active ingredient, tea tree oil, leaves behind a clean, fresh-smelling carpet without the need to scrub or rub, the company states. The tablets are pet-safe, biodegradable and formulated with natural ingredients, the company adds.