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I lived in a loft downtown for 4-5 years and daily drove my M3, even every day in the winter. Only option was coin op wash and it was painless. Take buckets and fill with the minimum $2 initial spend. Quickly wash and the rinse. Pull out and dry. Never got hassled and the water at those places is always warm. Only issue I had sometimes was drying quickly enough in the sun. I sold my car with over 60k miles and it was in phenomenal conspiring.

If you want to splurge, Finish Line on Colo Blvd does a hand wash, just call ahead of time. They do a good job, too.