You know those heat guns that are used to strip paint? If you suspend your circuit board horizontally between two posts and blow hot air from such a gun onto the backside of the circuit board then after a minute or so (depending on how close you hold the gun) most of the heavier surface mount parts will just fall off. Some plastic bits on the side you are blowing on will melt, so if you want those, take them off first.
Oh, and do this all outside or the gases will stunt your growth.