I get what you're saying. Time will tell as far as trebles go. Definitely something I'd be careful with.
As far as cleaning goes, obviously mine is new, but after driving 1500 miles home and the last stretch of it through a snow storm, it was filthy. Just regular hose water (don't pressure wash) and a light brush cleaned it up pretty easily. I've seen saltwater boats that gaff and bleed fish on the deck cleaned up pretty well afterwards that had aquatraction.