I do not use canned air on my machine nor would I. I have however used it on the computer keyboard and what a waste. Not to mention you get the chemicals on your fingertips when you type and IF you happen to get them in your mouth --- yuck! So I don't use it. Besides, it is too expensive. Vacuums work better.
Thanks again for the reminder. I am sure many were not aware.
PS - I agree with BellaBoo about the housing and such. I have stripped down my Janome 6600 P and put her back together without a problem. Dealer is over 200 miles away and sometimes you do what you gotta do to get that little piece of lint out that won't come out any other way.