I just ran it through the SCP utility menu 3 times with my disk cleaning kit "Allsop". I also cleaned it manually with a q-tip but the drive is still only making blank g64 images. The drive head looks clean as there is no visible discoloration or signs of dirt. Perhaps the head died or the drive itself. It appears to operate normally but simply doesn't read data. 
I wish I had an old PC to put it into and test to see if it could read PC disks.
I wish I had an old PC to put it into and test to see if it could read PC disks.