First, don’t panic. No, you don’t need to buy a whole-house water softener (though it helps). You just need the right weapons.
Acid is the secret. Since the stain is a mineral (base), an acid neutralizes it. Vinegar is the classic hero here. Lemon juice works, too.
But please don’t use vinegar on natural stone like marble. That’s a chemistry party you don’t want to clean up.
A Quick Survival Guide
Mix equal parts white vinegar and water in a spray bottle. Spritz the stain, let it sit for a few minutes, then wipe.
How to Remove Hard Water Stains from Anything — Pro Housekeepers
For stubborn, crusty rings around your faucet? Soak a paper towel in vinegar and wrap it around the base like a tiny mummy. Let it sit for 15 minutes.
Rinse well. If it’s still there? Repeat. You’re essentially dissolving rock with kitchen ingredients. Science is wild.
