Liquid Citrus Drain Opener 1 Gallon: Our natural, multipurpose, high performance material has a specially formulated d-Limonene base. It effectively liquefies grease, sludge, cooking oil, hard water deposits, organic matter, soap scum, and slime, while controlling odor. It leaves behind a pleasant citrus scent. Environmentally safe, it cleans and deodorizes grease traps, drains, garbage disposals, dumpsters, sewage treatment plants, trash compacters, sumps, and restaurants. Versatile, it may also be added to mop water.