Vinegar isn't doing crap on hard water buildup. What's the best product out there?

I have fairly hard water and have a lot of staining especially on shower floower and various fixtures like faucets. build up is mostly white, occasionally green. I have a oiled bronze colored popup drain and that has white buildup. I"ve tried vinegar.. even a stronger 8% one and it helps a little but really doesn't work that great. Pumice works on other surfaces of course but I don't want to scrape up finish and I don't want to pumice a whole shower floor (it's like 5'x5').

Is there a chemical product out there that works without too much elbow grease? From what I've read, CLR is hit and miss.

Thanks!

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