So I washed my tiny MX -5 today and I experimented with the optum no rinse car wash concentrate. I’m pretty sure Mike McKelvey was the one who posted it on the site years ago. If you follow the directions on the bottle and don’t want to get your car very wet it works fine. But if you’re not afraid to get your car wet I found this works well. I added maybe a capful to my warm water wash bucket that had some generic armoral car wash soap in it.
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