Windex Shower Cleaner Refill prevents soap scum and eliminates grime building up. Get a streak-free shine on a number of surfaces around the shower including most shower and bath surfaces. It also includes cleaning the shower doors and plastic shower curtains, porcelain, rubber grout, tiles, cultured marble, and chrome. Spray 40cm from surface to be cleaned/start with a clean shower. Immediately after showering, spray a light mist of Windex Shower over the interior wet surfaces including the curtain or door. Do not scrub, rinse or wipe off.