Tough on Dirt, Gentle on the Earth. With Bac-Out® Technology. Eco-Friendly Digesters & Plant Extracts Prevents Clogs. Eliminates Odors. Enzymes & Natural Live Cultures. We Are The Environment Our everyday cleaning choices affect our health, the health of our families, and the health of our planet. Biokleen™ household products are a natural, non-toxic and effective choice for you and the environment. Bac-Out® Drain Care combines the latest technology of enzymes with natural live cultures for ultimate drain care and maintenance. Enzymes work to break down grease, fat.