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Old 10-28-2012, 10:08 PM   #5
tock172
Beachtown Bill Collector
 
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Join Date: Jan 2011
Location: San Diego
Posts: 2,885
My Ride: '99 Techno Violet M3
I did some research and discovered vinegar and water works to remove hard water stains. I laid a towel soaked with 50/50 water/vinegar on the problem area for 7 minutes to let it fully penetrate. Afterwords, I dried the area and hit it with scratch x two more times. No more spots. After that I threw 2 coats of P21S hard wax over the whole area and it looks great.
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1999 Techno Violet Metallic BMW M3
2005 Audi B6 S4 quattro 6MT
2004 BMW 330i
1986 BMW 535i

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