Long story short, applying aerosol sun tan lotion in your shower, which has hard water, is a horrible idea. The result was a seemingly permanent, spotty, orange stain all over the tub. Nothing, and I mean nothing, was doing the trick no matter what we did- every cleaning product, bleach, ammonia, soaking it in dish soap, and even our steam mop, made 0 improvement. A little elbow grease and this magic sponge is the only thing that worked. I honestly don’t understand what makes this sponge so great, but it really is magic.