Have you pulled your carb apart? Usually if you do that, you can get to any crap that's in there.. Where in the body is it? You could pull the needle valve and run some really thin music wire down the tube. (Been there done that!) I know gasoline disolves slilcone, it's just a matter of how long would it take, and what would it do to the rest of the engine?

Let us know what you figure out.
Matt