I also used Soft Scrub with success, but the thing that helps with the elbow grease part is good old(use new) nylon net. That net is the best stuff ever for cleaning spots on the floor , tub and shower. I use it all the time in the bathroom, by yards of it and when the stiffness is gone, AI get anoither big wad. Try it, you will love it. Oh, the vineagar works too.