Use fine grade of sandpaper that you use with water only. This does not harm the sink or the toilets. Be sure to use it in water...That is what these are made for to use in water only..
I use a pumice stone for hard stains in my tub and sinks. Since I live in an apt. I needed to find cheap solutions to many cleaning problems. I was not willing to replace "THEIR" tub. I have found that a softer pumice stone works best on white porcelian sinks and tubs. Although the stone does disolve quickly, and you might need a few stones for larger jobs... it is well worth it. This method is much cheaper obviously than replacing the item or trying to have it professionally cleaned. I absolutly swear by my pumice stones! JUST BE CAREFULL . As you can imagine it will scratch on laquered or finished shiny surfaces. I found that there are many uses for the pumice stone but you just have to use common sense as with anything else! Good Luck!
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