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
Secret plumbers trick to unclog a toilet without using a plunger! I'm guessing this will work better for a toilet clogged by [ahem] biological products and not paper and items that should not have been flushed but still may be helpful.