For cleaning the outside of the machine and the cabinet, Joe's right. Glenn's instructions are great. As for cleaning the machine itself, I'd go to Muv's videos, HOW TO CLEAN UP and use a vintage sewing machine - videos by Muv and Fav. You'll find them on the vintage page. When I got my treadle, her videos were so helpful to me. I have a 127 but the design on the front is different.... it's pheasants.
And, I see this is your first post.... Welcome. You have to be careful on this site. You'll become a vintage sewing machine addict...... I started with 1 vintage machine..... now I have 10. But it is a fun hobby, collecting these old beauties..... saving them from the garbage dump.