Hmmm, good question.... If I were in your situation I would likely go to one of the self-serve bays with the high pressure wand, but bring your own bucket and wash mitt and try not to use the full force of the high pressure water, it can find it's way into tiny cracks and freeze...
or seriously consider buying a hardtop for the winter months.
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kabel
Orlando - 99 BMW M Coupe (autocross toy), '11 Mazdaspeed 3 (dog hauler), '99 10AE Miata (the new daily driver)
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