We have had our pool for about 5 years now and the stains on the liner and steps have become really gross. Black rings around the steps and every portion of the liner that was once white is now black. I never purchased any of the stain removers because they cost so much and I just kept putting it off. This year for some reason I had the bright idea to use the Magic Eraser (made by Mr. Clean) to see if that removed the stains. Well it not only removed the stains, but made everything look brand new! I couldn't believe how great it works! I didn't even need to scrub that hard, it just took all the dirt right off. Steps are bright white again and the liner looks new!
I highly recommend everyone try this instead of spending so much on stain removers.