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      04-16-2011, 08:34 AM   #4
doughboy
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Drives: 2016 M6 Gran Coupe LCI
Join Date: Jan 2009
Location: UK - Midlands

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Agree with toxic.

I'm no expert, but microfibre towel drying the car after washing it stops the discolouring.

It only seems to happen if you leave it wet.
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