Same thing happened to my acura a number of years back - turned out it was reclaimed/recycled water from the irrigation system, the hood and fenders needed color sanding to get rid of the spots, and if you know where they were, you can still find traces!

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John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E