OK, I need some bathroom cleaner companies to step up for me... I have had this stain on my (cheap) shower wall since before my gram died and I moved in, back in 2001 before 9/11. It's water from a well, there's rust & dirt from the bottom of the well. I have used almost everything. SOMETHING is out there that can take this off. I will gladly do a free review in exchange for the free product. You can see that I have TRIED to scrub it off by the 'stripes' a green scrubbie left, but nothing else would come off, it's crazy.