Hard water stains are very unsightly and often extremely difficult to clean. There are several household products that can effectively remove hard water stains in the toilet without the use of harsh chemicals.: Baking Soda and Vinegar
This is a must for every household. When I had the girls my mom told me to keep a bucket of water and borax, when I took of their clothes with stains I'd put it in there to soak. I'd wash them and they came out spotless I still use this stuff.