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i think you might look into your fuel source. Residue from gasoline engines tends to go down, staining the tips or any flush bodywork. I sit in traffic every day about the same amount daily too. Granted i have an LX, but the only time you usually see exhaust residue going UP is on older diesels especially like 70's era Mercedes, older (badly-maintained) Mitsubishis and other bad-maintenance victims. Diesel stains b/c the nasty goes up with the exhaust gasses (and b/c there's alot more than with petrol) and neglected cars get it for any number of reasons.
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