DIY Hard Water Stain Remover. •Fill up nearly half of a spray bottle with vinegar. •Add 1/4 cup lemon juice. •Fill up the majority of space left in spray bottle with dishsoap of choice. •Shake to mix. [For extreme stains, before using spray, first pour a little baking soda on the tough spots, let sit for 5 minutes; rinse.]
The Thrifty Home: How to Remove Hard Water- Soak paper towels in vinegar & place them on the areas with hard water. Use a spray bottle filled with vinegar to spray the towels periodically. After about 20+ minutes, take the towels off & scrub off the hard water with an old toothbrush. Repeat and wait an hour if needed.