Sorry Allison, I meant to say the head was heavily coated with oxide from
the disk platter, not oxidized itself! :)
I just removed the two lower heads, and neither comes clean with 91%
alcohol. Now I'm just soaking the heads in a glass in the alcohol, and
waiting overnight to see if they'll then come clean. If that fails, I was
wondering about a toothbrush with just 91% alcohol.