I have used the McGuires Gold and NXT since I got the car. I am very happy with the results. I keep my Car in the garage on only take it out on good weather days. So I can't really speak for its lasting ability with prolonged exposer to the elements.
But tried to use Mcguires lower tier car wash "The Purple stuff" on my daily driver and I would not recomend it. Just hated the results, it does nothing to help with getting road oils off the car.
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