Mr Muscle 5 in 1 Shower Shine™ is a daily shower spray that helps to prevent the build up of limescale, soap scum and grime. If used daily, you'll never need to scrub the shower again. Mr Muscle 5 in 1 Shower Shine™ is safe for use on most non-wooden surfaces in the shower area, including fibreglass, porcelain, chrome, tiles, glass, plastics, acrylics and shower curtains.