My guess is they do it for your own good. They don't want to scratch your car ( jacket or pants buttons) having to lean over so far to reach it so they wipe down what they can in a very short amount of time.
I actually don't even have the people wipe the cars at all. I stop by the vacuums and wipe the windows myself.
That sounds about right to me definitely how much you pay but then again I don't work there so it's all good
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