Mike,
See if you can get a cleaning diskette somewhere, preferably one that has a tissue disk inside and a little bottle of fluid to wet the disk (wet cleaning system), since the dry cleaning diskettes are pretty abrasive on the heads and don't even work all that well.
After 2 years, I had to do both my computer diskette drives because neither would read a diskette (or format for that matter). After the wet cleaning, they work like a charm.
Gr.
John
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Have a nice day