I recently picked up a couple old Apple II programs the local library was discarding. When I booted one of the program disk it loaded the first screen then failed. A second boot got me a "check startup device" message. I then booted a known working 5.25 disk program and got the check startup device message again. I cleaned the drive head and that solved the startup problem.
I figured the library floppy I have, that started the problem, must be very dirty. Is there a way to clean the floppy itself beyond the self cleaning felt inside the plastic exterior or is the disk a total loss?