My chrome shower is like brand new

I can't remove the hard water stains on my bathroom chrome fixtures. I don't want to use harsh chemicals with young kids around, so I just let them be. I was using my kid's Bebebalm UNDO to erase doodles on the wall. I was revved up to see what else it can erase, I tried it on the chrome bathroom fixtures. The green mildew and hard water stains were erased instantly!
-Carol, Shanghai China