I would try degaussing it also by using a real degaussing tool; but since they are expensive (about $35+ship) you can try with a regular soldering gun. They have a transformer inside that produces a strong variable magnetic field. Because the magnetic field is variable, conversely to a permanet magnet, it's less likely that the tube remains magnetized after it's use. You put the gun sideways at about 1 feet from the screen, pull the trigger and start moving it away from the screen in a circular motion and release the trigger. If the magnetization of the tube is not very strong it should take it away.