I opened my above ground pool last weekend and was faced with the annual problem of cleaning the stain that forms just above the water line. Just for kicks, I grabbed a Mr. Clean Magic Eraser. I was astounded! Damn near close to zero effort and the stain was gone! I don't know what's in this thing but it's a miracle!
Which brings me to my question. What, exactly, is in this thing? Is it safe for my vinyl pool liner? (I know -- I should have asked before I used it). Assuming it's compatible with vinyl, I'd strongly recommend it for this purpose.