You really shouldn't
Quoted from tiesmasc:Use a desoldering iron (cheap kind with the red suction bulb)
They get incredibly hot and will probably damage the board or lift a trace in the process.
If you want to attempt repairs on (expensive) circuit boards you should get a temperature (not wattage) controlled soldering iron and use it with a solder sucker. Better yet, get a desoldering iron. But they cost a bit more.