Demagging
i heard you could use a vhs head degausser but who has that? I did once!
From sciencing.com: https://sciencing.com/demagnetize-magnet-5071154.html
just hammering it with light steel hammer on the top of the motor frame should do it. Most locos that lost their magnetraction did so from sharp falls. Don’t overdo it and not so hard to deform the frame. If you hit it on edge should be doable. Then just clean it up normal. Power washing scare me especially around windings. Beats tossing it.
