My venture into the world if demagnitizing vinyl. Your results may vary.

Ok, I have been using my hand held demagnitizer (tape bulk eraser) on these particular versions of records in my collection that have accentuated treble ( The Who- "Who's Next" MCA masterphile, "Tommy", "Sell Out" , Ted Nugent "CSF" and the Dixie Dregs "Industry Standard" and the initial results are in. YES! a resounding yes. Positive. Eye opening or should I say ear opening. At first I was skeptical having heard about it from a Michael Fremer review about 8 years ago. The curiosity finally overwhelmed me. Boy I wish I had known and tried this earlier. The single best tweek I have experienced bar none. After treatment every note was the most profound note ever struck until the next one and the next one with me anxiously waiting for that next note. It was like analog on acid with me hearing a whole new sonic landscape. I can now imagine how it is justified by spending 3 grand on a dedicated device. My procedure is as follows with a Radio Shack bulk eraser. To protect the record I laid it on an album sleeve with another sleeve on top to protect the record to get as close as possible with the unit. I used the unit as I would on a tape deck with being slow and steady. I also did both sides.
  Ok ok I'm being serious now. Back to earth and not the way over the top and dramatic description as the above. I might (BEING THE KEY WORD) might have heard a high frequency mellowing on CSF and the Dixie Dregs. Actually on CSF it was a little more than maybe. I'm a little embarrassed saying that and that leaves me open to ridicule. That perplexes me. I know its far out there in pseudo science land but I think or maybe I thought I heard something subtle. Definitely it's not a slam dunk case. The science states that there is practically nothing on the record that would react to any degree with a demagnitizer. I might try a couple more. I would hope some fellow Audiogoners would have an open mind and see if they have any positive results with the procedure above with some treble accentuated records.
I also have diminished hearing and it was hard to tell.
Oh well it was fun.