I strongly doubt a tape degausser will do you much good.
Likewise a color-TV coil.

You need a lot of field strength to clean [really, re-randomize..]
structual steel. You also need to be able to get that field where
it's needed.

Tapes and TV sets are orders of magnitude more subtle than the
results of a strike.

But feel free to try; just get the compasses well away before you
start.
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