Mr Muscle Shower Clean is a revolutionary product that sprays on to prevent soap scum, mould & meldew stains building up. Never scrub again! - Cleans & prevents soap scum - Simply Spray Daily - No Scrubbing, No Wiping, No Rinsing! - Septic Safe Ideal for most shower & bath surfaces including glass shower doors, tile, chrome, porcelain, cultured marble, plastic shower curtains, rubber, silicone and acrylics. Do not use on any worn damaged or cracked surfaces, gold-plated fittings, brass, natural marble, natural stone, latex caulk, finished wooden surfaces or resurfaced enamel. If in doubt, test in an inconspicuous area first.