Details: Rain‑X shower door extreme clean removes harsh build-up on glass Shower doors to deliver the ultimate in sparkling clean. This unique product, specially formulated for use on glass Shower doors, is ideal for removing soap scum, dirt, hard water build-up, calcium, lime stains and rust stains.Directions:Apply to damp, soft cloth or directly onto glass shower door.Applying pressure and using a circular motion, rub onto surface.Rinse and wipe dry with a clean paper towel or cotton cloth.