I keep the soap scum off by using homemade shower spray. I use 1/2 cup vinegar, and l 1/2 cupes water and a few drops of scented oil (either orange or lemon). We have a lot of minerals in our well water, so a film can build up quickly. We spray the entire shower walls after every use, and it keeps them clean until I do the regular cleaning. No more soap or mineral build up