Did my due diligence looking in the archives for cleaning tips for cleaning the black plastic below the windshield - and found none. Just finished a 4500 mile trip from Vermont to Manitoba and back. Estimate I killed 10% of the bugs along the 2 Provinces and 8 States. Cleaned up the 2007 RT and looks good except for that plastic that looks more grey than black. Local Beemer shop suggested 'any tire cleaner product'. Ones I looked at had petroleum or corrosive warnings.