Tips

Spray the hard water stains generously with vinegar and let it sit for five to 10 minutes, depending on how stubborn your stain is. Before you spray the stain, be sure to test a small area of your counter or tile to make sure the vinegar won't leave marks. It's friendly for most surfaces, with the exception of marble. I tried this on my granite kitchen counter too, and it worked beautifully.I left the vinegar on this stain for about 10 minutes total, after doing a test for five minutes.

Natural DIY with little chemical aftereffects.