I tried the magic eraser sponge(in small areas where I had black mark) and L.A's Totally Awesome interior cleaner. Both worked well in brightening up the white vinyl interior. I'll say this as a word to the wise though, avoid leaving the interior cleaner sitting on your fiberglass gel coat. It will leave a temporary mark that seems to go away. There was some leaked cleaner from the spray handle on the bottom of the bottle that when I moved the bottle the next day left a ring imprint of the bottle bottom on the gelcoat. As days have gone by, it seems to have gone away.
I'd like to still hit it with the Interior Conditioner from Boat Candy, but I try to avoid Amazon when possible....Jeff Bezos, founder, is a douche that advocates for trash, garbage so I avoid supporting his businesses as much as posslble. PBC has still not replied to my inquires from their website. Amazing.