Ken, after living in Chicago for 20 years with black cars, I know what you are talking about.
My solution, when I couldn't hand wash, was to use a "touchless" automatic car wash....Sonic in Chicago....the only thing touching your car is water and, optionally, towels that they use to hand dry.
I spoke to the manager and he assured me they only use 100% cotton towels and showed me the labels. I was comfortable, but if you aren't, either take your own towels to the place or just drive off and dry it yourself.
I never had any problems with swirls in 20 years of doing that.....door dings in parking lots, well, another story!
My solution, when I couldn't hand wash, was to use a "touchless" automatic car wash....Sonic in Chicago....the only thing touching your car is water and, optionally, towels that they use to hand dry.
I spoke to the manager and he assured me they only use 100% cotton towels and showed me the labels. I was comfortable, but if you aren't, either take your own towels to the place or just drive off and dry it yourself.
I never had any problems with swirls in 20 years of doing that.....door dings in parking lots, well, another story!