Mechanical way is probably the best, either pressure washer or brush and water. Copper sulphate or zinc chloride is often used to kill moss on buildings, driveways but I am not sure it's good idea to use them on car.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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