Hard water minerals are similar to what make up marbles and many magnesium/calcium carbonate-based rock minerals.
Vinegar and commercial lime/calcium/rust cleaners like CLP and Lime-Away are safe to use for granite since they don't react with quartz.
You can also use mechanical means like fine sandpaper, Scotch-Brite or wire brush to clean granite if you don't want to use chemicals.
From: Lori Granger <redteam@frostyscorner.com>
To: "DoIt_Yourself@yahoogroups.com" <DoIt_Yourself@yahoogroups.com>
Sent: Friday, March 29, 2013 5:09 AM
Subject: [DIY] Hard Water Minerals on Granite
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