I cleaned my trimmer (the guard, gear head, and bottom of shaft). It was so dirty! I feel better now that the gear head is clean. Here are some before and after pictures. In the background of a few of the pictures you can see my edger, which is pretty clean, so you can compare my trimmer to that!
Before / After
Attachment 9825 Attachment 9833
Attachment 9841 Attachment 9849
During / After
Attachment 9857 Attachment 9865
Before / After
Attachment 9825 Attachment 9833
Attachment 9841 Attachment 9849
During / After
Attachment 9857 Attachment 9865