First thing, do not go to those do it your self car washes, land scape trucks go in there and clean there equipment out. your father in law sounds like mine, and the only thing that gets through to them is yelling. i lucked out my house has a 2 car garage and the stang is put away for the winter and the inlaws are not aloud in there. they mean well but they just dont understand. have your wife talk to him.
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