Thanks All for this great info. I haven't figured out how to reply directly to your posts, but I appreciate the input.

 

try getting the blade of a utility knife in there. The ones where the blade is pretty narrow and slides out of the handle. Then slowly saw your way around. Silicon usually cuts pretty easy with a sharp blade.
Take sandwiches and a few beers with you under the vehicle. It will take forever but should be damage free.
What do you have more of, money or time ?