The Soap Scum Menace

A couple cleaning suggestions that cropped up more frequently than others, however, included Bar Keepers Friend or creating a 1:1 mixture of hot vinegar and blue Dawn (try 2:1 if it’s too sudsy…some of the Dawn bottles are extra concentrated) sprayed on, allowed to work in for 10-15 minutes or longer, and wiped off.
Once you get your shower clean there should be no reason to sound the retreat. With prevention and your personalized method of deep cleaning, soap scum won’t stand a chance. Good luck, may your shower doors be ever crystal clear and your walls squeaky clean.

The best strategy should exploit the weaknesses of our adversary. Short of taking out a second mortgage to filter all the water we shower with, we are unable to prevent soap residue from interacting with minerals in the water. This leaves us attempting to prevent the precipitates from sticking to the walls of our showers. Lemon oil and Rain-X are both suggested prevention methods (also some good treatment recommendations at that link). Of course, preventative measure will only work on a clean surface. For that there are endless products on the market and the variety of successes described in reviews suggests that soap scums are not all created equal. There are so many variables when considering all the different types of soaps, sources of water, and surfaces of bathtub material that there may be a bit of trial and error in finding a solution that will win you your war.