At this time we don't have any products specifically for removing the remnants left on the hull from barnacles.
I did some searching with Google and found some options that seem to work for other guys here.
Barnacle's - How to remove?
Looks like the best advice besides the various gel removers and rigid scrapers is to get right on this after you pull the boat out of the water before the
barnacles dry and then solidify their contact to your hull.
I'll tell John Greviskis about this thread on our forum as I think you're correct in that a lot of people run into this problem and the
how-to for undoing the damage would make a great segment.