I recently bought a used Singer 600 that belonged to someone's grandmother. The top was nice and clean, but when I looked at the bottom of the machine it was packed with dust bunnies, thread, etc. Those parts were really working to keep moving! I used a tweezers to get the stuff out -- then vacuumed with a mini-vac from Nancy's Notions that is an excellent size & owrks on my computer and printer too. After it was all cleaned, I oiled with sewing machine oil. Machine runs like a charm now.
BTW, Joann's has these lint brushes. I believe you can find them at many of the sights like Nancy's Notions, Clothilde etc. as well. I have one in each machine I own (8) and believe me, they aren't original! Can you picture a lint brush after 100 years? :)