When smt first started coming out, many of them were reusable and I had and old converted reflow toaster oven. Any boards I was trying to salvage smt parts on, I would switch on only the bottom heater to high and stick the board in there with a catch tray. Just keep tapping on the board top side with a metal wand so not to burn my fingers. This would knock off the components into the tray below and I could sort out the ones I wanted to keep.
I harvest lots of smt parts doing that but after some time when money wasn't so tight, I then started to buy more new parts and found that easier. I still have a converted reflow oven I use when I do hand batches of small items.
Jamie