Okay, this is from an expert sewing machine repairwoman (not me !): do not use compressed air. I just picked up my Bernina after getting it cleaned and serviced and she asked me what I used to clean it with. I said: compressed air. She said that was a no-no, use a vacuum cleaner. She said all we do is push the dirt, lint, oil whatever into piles that does not blow out. So that is what I will do in the future. This woman is a true expert at repairing all machines, she has quite a reputation in our area.