I once touched the glass of my driver side mirror in winter to test the heated mirror feature to satisfy my curiosity. It was quite hot to the touch. Now there's a permanent spot on it like you describe. Don't know what happened to you though.
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'08 Z4 ///M Coupé (#1765/1815) — 1 of 68 Sepang Bronze / Black Nappa / Madeira Wood / 1 of 1 this combo
19" Advan RS / AP Racing / Bridgestone RE-11 / Autosolutions SSK / R.E. Diablo / R.E. trans mounts
'09 X5 35d — Space Grey / Saddle Brown
20" Forgestar F14 / SCR Delete
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