I do use the canned air on my machine .... but only in those places where I can blow away from moving parts. So, if I am doing the tension areas of my machine I firmly cover the bobbin area before using the can so I don't force any lint or 'stuff' into where I definitely don't want it.
Watch the repair person work on your machine. They all use compressed air. They know how to use it correctly and will even tell you how to do it yourself.
ali