Preparing Small engines for winter storage

With winter upon us we need to ensure that our mowers, weedeaters, are put up for the winter.  One method is to take all of the fuel out of the tank and start the engine and run until the fuel is out of the carb.  The problem with this is there can be residual fuel that will turn to a varnish type substance and when spring comes your engine will not start.  The best method is to use an additive to stabilize the gas through the winter so the engine will start!