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The conclusion, with a focus on cleaning the actual playback, recording (if equipped) and erasure heads. Note that you must not attempt to demagnetize an erase head that is of the permanent magnet type. If your cassette transport has an erase head that "swivels" out of the way when not in recording mode, it's probably a cheap permanent magnet type.
Although I don't think there was a huge (if any) difference, I threw in a "before" and "after" demonstration at the end.