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Old 07-21-2012, 04:01 PM   #2 (permalink)
SailFree
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Some have suggested it is bee poop and that you may be parking in a bee flyway.

What's behind spots on autos? - Los Angeles Times

Others say rust/lime mixture dripping off old garage door?

Last edited by SailFree; 07-21-2012 at 04:06 PM.
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