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A trick that I saw a recycling place use: Take a cookie baking tray, put about 1/4 " of fine sand in it and enough motor oil to wet the sand. Put the tray on a propane burner and heat it to the melting point of your solder +10-25 degs. Take a PCB with thruhole parts or top SMT, place it on the wet sand, press it in a little to make good thermal contact and with gloves/needle nose, start picking parts out of the PCB, it heats up quickly so work fast. This is good if you've got many boards to salvage.