303, Klasse Leather/Vinyl.., or 3M vinyl restorer. Of these, which provides best protection? Which is most durable? Is it better to use two dedicated products or will a good combo formula actually work? Have tried many OTC goops, but still can't get the dash, seats and interior trim as clean and sheen as I'd like.Cost and ease of application are secondary considerations. Chime in Pros and fanatics; all Geek opinions sought.
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