Aluminum wedge is "in" the way? If that's the case, and it's the typical stepped wedge what I do is take a chisel and try to get a bite in the wedge from one end. By "end" I mean the short edge/side - however you wanna look at it. Sometimes I go from both sides back and forth. I just keep trying to get a bite until I can begin tapping the chisel somewhat upward, lifting the wedge out. It's difficult to describe but it's a pretty effective way to get them out. It seems like you get nowhere at first but the wedge really only has one direction to move - up - and eventually it will. Once you get a good hook in the side of the wedge, it'll really start to lift up.