Have you got a telephone line above where you park your car? Every time it rains, I get browny/black spots on the roof bonnet and boot. Could not work out why it only occurred when it rained or a very damp nightime. Then I noticed that the phone line was directly above where I park the car. Must be all the muck that collects there from birds and dust. Check it out
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Great Barr, Birmingham.
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