You can make cleaning your fiberglas shower walls a little easier if you wax and polish the walls with regular auto wax after you wash them down. The wtaer beads up on the walls along with any soap scum. So after you’re done drying off and you have no more personal use for the towel, use it to wipe down the shower walls. Do this after each shower, and you will be amazed at how clean your shower stays. Do not use the wax on glass shower doors or your shower floor as it will make the floor VERY slippery.