Powered by 100% natural citric Extracts. Scrub-a-dub-dub the grime off the tub. Prevents soap scum build-up with gunkguard. Powerful formulas. Clean freak approved. Safer products. Gunkguard a naturally-derived polymer that creates an invisible barrier that prevents new soap scum build-up. Cleans soap scum and hardwater build-up from: Shower doors, fixtures, tubs, sinks, tile, glass. Non-toxic. Biodegradable. We're here to help. Facebook/LemiShine. LemiShine.com. 888-336-2582 M-F 9am - 5pm (CST). Made in the USA.