I've used 303 on boats for years. I just started using it in the boxster in the past year. I've always used raggtopp too. I just purchased 303 top / canvass protectant to give it a try on the top. It'll have to perform well to make me switch from raggtopp brand. For the leather I've tried lots of over the counter stuff with not very good results. Perfectlap's suggestion is worth a look.
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