Here's a website with cleaning info:
http://www.treadleon.net/sewingmachi...gmachines.html
and another one:
http://scheong.wordpress.com/2012/07...ewing-machine/
I like using sewing machine oil to clean a machine, as it will not ruin the decals.
Here's a Youtube video:
http://www.youtube.com/watch?v=bidpJsAzc2A (Part 1)
http://www.youtube.com/watch?v=SKR5t4DyPwM (Part 2)
If you Google "treadle sewing machine belt" you will find quite a few options, including eBay, Sears and Etsy. Here's a link to a sewing machine parts supply house:
http://www.sewingpartsonline.com/alp...adle-belt.aspx
There are also Youtube videos that show how to replace the belt.