Everyone in my family wipes the shower walls down with their towel after drying themself off. If you can get everyone to do this you will only have to spray the walls with scrubbling bubbles or other cleaner 2 or 3 times a year. My shower walls sparkle using this method. My only problem is the grout around the tub so I use a pointy tipped bottle filled with bleach squirted all along the grout and then let it dry. Grout turns white in a short time. Good idea to keep a window open or use the exhaust for the strong fumes from the bleach. Hopes this helps.