There is a chemical you can buy and use, Lime-Away. This works on shower heads as well. Be sure the room is well ventilated, it's not good to breath. Another product, I forget the name but the ads show brushes with eyes on them scrubbing the bathroom and use the term "scouring bubbles" claims to do the same thing.
Natural stuff is lemon juice and salt, or baking powder, a little water and a toothbrush, but be sure you dissolve the salt or it will scratch. Takes a lot of work to get it done. Ammonia may also do the trick, it's used in store products to clean burned on food off of pots and pans. Also need to ventilate the room, it's pretty strong.
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Request: Hard Water Stains on Glass Blocks
Archived on 09/04/2009
Do the remedies for removing hard water stains on glass showers work for glass block in a shower?
Cristy Schrank from Hudson, WI
Feedback:
RE: Hard Water Stains on Glass Blocks
Yes, glass blocks can be treated the same as shower doors. See below for a tried and tested technique.
Formula to Use:
Pure white vinegar
Method to Use:
Fill a clean spray bottle with pure vinegar
Spray the vinegar freely over the shower door and wait for a few minutes
If stains are stubborn spray more vinegar and wait a while longer
Scrub lightly with a soft sponge or cloth and rinse
