How can I get the bathroom shower and tub clean using hard water?
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I use vinegar on our fiberglass and porcelain pieces. Here's a post from a DIYer also, https://www.hometalk.com/diy/clean/house/how-to-remove-hard-water-stains-from-a-porcelain-sink-13158710
How to Remove Hard Water Stains From a Porcelain Sink
You may want to consider applying several coats of a good car wax to wall tiles, after cleaning, to reduce hard water deposits. If you can afford it, install a water softener for your bath.
https://www.hunker.com/13423221/what-will-clean-a-fiberglass-bathtub-with-set-in-hard-water-stains