What I meant was the magnetic fields most people are familiar with like in the water pump in your example, or speaker magnets, or starting up a motor next to a monitor, something like that. A hand held deguass coil will absolutely clean that up if the internal one wont do it. Fear not, your monitor is not destroyed. Just take it to a shop and give them 10 bucks to degauss it while you wait.
The magnetic fields you are describing where you work are obviously much greater in strength than the average household PC user is likely to come in contact with. I have zero experience with super strong magnetic fields you are describing... If you say they can trash a CRT, I believe you.
PS Glad you didnt get killed!
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