The sewing tech at my dealer's says not to use canned air to clean out the inside because it will blow stuff deeper into the machine. I use a little brush with semi-stiff bristles that came with my machine. If it has a lot of lint I BARELY dampen just the tip of the bristle and touch the lint and it sticks right to the brush and I pull it out and wipe on a scrap. When it's all cleaned out, a drop of oil and the machine is happy! :)