Removing Duct Tape Droppings

[Steve Jensen <sjensen@mindspring.com>]

Hi all:

Finally got around to replacing the quarter window on my car this weekend,
for those of you who haven't had the joy of black urethane getting all over
everything, you're missing a treat.  BTW, the spray cleaner Fantastik gets
it off paint nicely.

The problem is, I have some duct tape adhesive stuck to the inside lower
window trim panel.  The duct tape is gone, but the adhesive doesn't want to
come off.  We've had some unseasonably warm temps here - 70 deg F - so the
goo has been heat cycled a number of times.  What will take it off safely?
I've used diesel fuel to get rid of adhesives before but I don't want to
discolor the trim piece.  Suggestions?

Massive appreciation in advance.

-Steve Jensen
87 5KCSTQ