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I often get pickups in that look like they have been used to pickup debris from the bottom of the ocean. To loosen the ferrous debris you need to remove the magnetic field they the objects attract to. On humbuckers it is easy to remove the bar magnet and use compressed air to blow away…

I would carefully remove the magnet and remember how it was taken out. There is usually a black line on one edge of the bar magnet that usually designates the North polarity and faces the stud side of the coil. Having access to a table mounted motor and fine bristle wire wheel will usually do…