Having a magnetized screwdriver can be a life saver for getting a screw into a tight place, but that same screwdriver when used to nudge a small component around for soldering, or when it falls into a floor with steel chips that stick to it.
We learned in science class that we can magnetize the driver buy sticking a magnet to it and dragging it off the tip, but how to remove it is a bit more difficult.
Your trusty weller transformer type soldering gun makes a quick degausser.
The high ac currents flowing through the soldering iron tip makes a strong AC magnetic field. If the gun is turned on, and the screwdriver is placed in the gap and them smoothly pulled out to at least 6 inches, all magnetism will be removed.While in the gap it is getting magnetized north south 60 times a second, as it is slowly removed this reversing field gets gradually weaker and weaker until it has erased all trace of the original field.
Need it magnetized again, just grab the magnet.