What type of solvents, detailers, or detergents is used to remove the foam/tar substance that holds the spoiler down? I was thinking of hot water

and detergent, but I figured that there has to be some sort of a solvent out there for this kind of task. If you're removing the spoiler for the
1st time you'll understand what I talking about
: the substance is thick,dense,black and has the characteristic of tar & appears to act as a sponge. The detailer and windex hardly worked at all. Any suggestion would be appreciated. Thanks in advance.