Don't use the new type Bon Ami (Calcium carbonate). Use only the old style (Feldspar). And try it first on a corner. And don't expect it to work on deep scratches.

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Alan Weinschel
2001 S500 Capri Blue
2004 E320 4matic Wagon Tectite
1992 300TE 4matic Black Pearl
2000 BMW 540ia Anthracite