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If you got hot models you can use my driveway, lol I would check around with some local businesses that are in the area you want to do it, let them know what your plans are and they will usually work with you. What part of DFW are you talking about. I see softball teams doing it at O'Reillys and places like that. Just an idea.
A while back, i had a friend who had a carwash with her church at the Walmart off of N. Garland and George Bush. If i remember correctly, they had it near the lube place on the northside, closest to george bush. they had LOTS of traffic, and i think it was somewhat successful....Just some more ideas.