Al Kossow
Documentation Wizard
I use cyclomethicone for that. Seems to work every time.
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Current cleaning procedure I use for contaminated sleeves is slitting the sleeve, pulling the disk, cleaning with whiteboard cleaner, inspecting for surface faults under a magnifier, then air dry.
Lube with cyclomethicone just before reading. Important thing is making sure the diskette is absolutely dry so that the binder is solid.
For disks stuck to the sleeve, rinse in warm running water until the inside paper softens enough to pull the disk out, mat down with a towel and use the cleaning procedure.
I avoid IPA for diskette cleaning because I've had it soften/remove the binder.
If the diskette looks clean on inspection, just the lubrication may be all that's necessary.