I have clear glass shower doors. I have tried everything from CLR®, to Comet®, to Clorox® - you name it, I've tried it. Today I decided to try something different. I found a bottle of Resolve® spot remover for carpet and fabric. I figured "Why not? I have tried everything else." All I did was spray the Resolve® on the shower and with no effort ran a dish sponge over it and rinsed and every bit of the soap scum came off.
I found this tip on the internet, hope it works for ya all, it worked for me!