In case you didn't know it, the later year MBZ 123s didn't have the goo sticking the fenders on. You can always tell which are the easy-to-remove fenders by looking underneath in the fender well. If there is a large plastic liner, you've the easy ones.

Often you see the older models removed at the junkyard using a power saw. They saw it off inside the engine compartment and take it home to work off the goo.

Ben