I used canned air on the outside of my machine, to blast lint off of the presser foot and the like, but only with the plate ON so nothing goes into the machine. And when I pull the bobbin case out I'll blast that separately, but I don't blast anything inside the machine because it's not really going anywhere except deeper into the machine.
I use a little plastic-bristled paintbrush to grab lint gobbers. The longer handle lets me dip into the machine easier and it's kind of splayed out from years of usage so if I just touch lint, it'll grab it. I reach into areas the dealer would probably tell me to stay out of, but I'm careful and gentle and so far all is well. DON'T use a natural brush, the bristles will come out.
Canned air works to blast the lint off the brush too. (Aimed into a trash can, of course) It's also good for scattering annoying cats!! LOL (I don't actually shoot the cats with the air, just the noise scares them off.)