"The basis of an degaussing mechanism (the formal word for demagnetizing) is to expose the item being degaussed to a varying magnetic field whose intensity is lower gradually until the field strength reaches 0. When you place your watch in a regular coil degausser, the AC current changes the direction of the field 120 times per second (60 cycles per second gives 120 field direction reversals per second. At least, that's how it is in the US - in other places I believe they use 50 cps current, so they only get 100 field reversals per second).
So, you put the watch into the middle of the coil, turn it on, and slowly pull the watch out while the coil is on, until the watch is as far away from the coil as your arms can manage. Then you turn the coil off. The distance from the coil is what causes the diminishment of the field strength (which varies as the square of the distance)."
'via Blog this'
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