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Ahh How i love my heated pressure washer for times like ram_bo06 mentioned.... But, i still wont wash it myself if its below freezing (obviously the heated water will freeze upon hitting the truck ... eventually)... So for times like this... i goto my local drive-thru carwash Fully Automated, no foreigners in your car, only washes the outside, Fully enclosed automatic garage doors front and back .... Lowest package from 5$ most expensive is 12$... It Hot-Air dries it too.
Just before a good rain storm take some armorall car/wash/wax and a soft hand mitt and soap that baby up and come back after the rain. Perfect, I mean perfect! Although you look like a bit a of a jerk to your neighbors just before the rains come.