On Mon, 2 Jun 2008 11:53:59 -0700 (PDT), "Robert M. Gary"
wrote:

I have a Bayliner 185. The other day I "missed" the trailer a bit and
the hull rubbed up against the spare tire on the trailer. I tried just
rubbing the tire marks off the hull but that did not work. Do I need
more elbow grease, better products, a buffer?

Been there, done that.

Unfortunately, tire black is a major PIA. As long as the gelcoat
isn't scratched badly, use SoftScrub with bleach. Don't use a lot and
use it with a wet cloth. If that doesn't work (and it did on mine,
but not well enough), use a HD compound - just a little and again on a
wet cloth.

It will take a couple of minutes, but it does work.