Re: oxidation
Hey, I'm a lazy, tired, aching, old guy I always need to find the easiest way to do things,

vaseline is it

Did you ever spill oil on your boat, and the dark spots are permanent, vaseline works the same way on every surface, like chrome, SS, and vinyl,,,, and lasts longer, plus surprisingly it lightly cleans. Also, if there already is a shine on the boat, it will enhance it, before you even polish it
Many yrs ago, I first tried it on a my fairly new 69' Dodge Chargers matching medium lime green vinyl top, and was amazed at how well it came out, and stood up in the weather!

as I started I noticed some black tarry substance, large excess droplets from the factory used for waterproofing the glass, the vaseline dissolved them, and it took them right off, no muss/no fuss, leaving it like new!