PB blaster has done a good job for me on some of my really dirty auction/freebie/junk pile find saws, and others I have fixed for other people. Doesn't seem to discolor plastic or affect paint or rubber parts either. Just spray the saw down with it and let it soak for a while, clean it off with air, take off covers, clean under them, use a old paintbrush/toothbrush on the stuck-on crap, more air, etc., repeat steps when necessary. Then just wipe it down with a paper towel or rag when done.