I have noticed that the bottom of my boat is starting to yellow. I keep it on a lift out of the saltwater. What is the best product to use to clean the bottom.

What about rubbing compound?

Also what about an extremely fine grit sandpaper for more speed?

I think you can use like "Tidy Bowl " or any of the tollet cleaners .....they have a mild acid in them that will remove the yellow .....prob need to get that verified ..but I believe I am right ....

Muratic acid. Use a pump garden sprayer to spray it on. Probably shouldn't use it while on the lift. The fishy's won't like it.

on-off,spray it on,hose it off.and it doesn't hurt
the wax

Probably shouldn't use it if the wind's blowing either. Your skin wont like it.
Gary

Starbrite Hull cleaner is maybe more mild. I use it sparingly works well. Keep everything wet with your hose. You have a 1999 I don't think I would use sandpaper unless all else fails.

Wouldn't recomend rubb comp either