Has anyone used their DA polisher to polish a porcelain bathtub and tile shower with hard water stains? If so, what polish and pad combo would you recommend?
I'd venture to say, no reason to not give it a try.
BUT, if the surface is worn I'd be leery of really staining the object. Remember, porcelain is clay with a fired surface (like pottery). Once that outer layer is worn away, it's like a sponge.