Also try, in an inconspicuous place, a green Scotch pad. I have a brand new condo that even had a sticker on the shower door not to use harsh chemicals. The water spots were horrendous which took me by surprise for being brand new. I tried Lime-Away 1 cleaning and it helped a bit but the next time, I used both the Lime-Away and the Scotch pad. Gorgeous!!! Remember, try it where you'll never see if it does scratch but this new "dainty" shower door, needed harsh cleaning and it got it....making it looking brand new.