For what it's worth, here's what I do. During the driving season I was the Box as often as necessary, but not the top. I usually just rinse it off. But, once a year I wash the top using Dawn dish detergent and a soft brush. After that, there's no beading of water whatsoever. After it dries I apply the 303 with the foam brush. Wait 24 hours and then go over it with a lint roller. Voila. It's like new again.
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