This is my bathroom faucet. Hard water stains make me crazy. I have tried about every trick in the book to get rid of them. This is one trick that is going to be my go to for this type of faucet. And the best part is that only two ingredients are used! Cleaning Vinegar has 6% acidity instead of the 5% acidity found in regular vinegar. That little 1% difference boosts all the good attributes of vinegar by 20%! Pour some salt into a small bowl and then add enough cleaning vinegar to make a paste. Apply to the faucet and let it sit for half an hour. Rinse with warm water and if needed rub with soft scrubber. This worked great in this type of faucet. Now how to make the paste stick to a shower door. Any suggestions are welcomed.