Canned air, white lithium grease, standard sewing machine oil (Tajima is what I have on hand).
Won't really make of a difference. The fluff is more from what you are embroidering not the bobbin thread.I get so much fluff that my hook has an afro. I'm gonna start using magna-glides to cut that down.
For the hook area, I just use my breath and blow, or canned air. I also use a small stiff bristled paint brush to get into some areas.What do you use to clean your machine? I've seen spray cleaners, but not sure of what to spray.
In your manual should be an grease/oiling schedule and a diagram of where to oil and place grease.What on the machine needs to be lubed? I have a PR-600 now and don't want to have to take it to the shop every time I need to do something to it. Hell, what do you use to lube them?