Yup, ditto on the car wash soap (detergent, actually). The phosphates in the detergent will likely do your lawn some good.
I like to keep a coat or two of Collinite Fleet Wax on my trailer, and rely on the car wash stuff to not remove it all.
I use Spic & Span on the roof. No ill effect noticed on the lawn. It's a fairly benign cleaner.
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