After doing many sets of rear control arm bushings on 510s and then yesterday, doing the front upper and lower control arm bushings on my wife's Lexus LS400, I use a propane torch method, with the arm in a vise and heat the outside of the arm and let the thing burn it's way totally out. (a piece of cardboard on the floor and prepare to blow out drops of flaming, burning rubber) If you let it get really hot and burn itself out, the rubber is then dry and crumbles away. Then use a piece of emery clothe, you can quickly & easily just clean up the surface for the new bushing.
If you just get it hot enough to push it out, there is much more clean up work and that melted, slimy rubber is nasty. Just my 2 cents.