I have had that happen to one of my irons.
I took a brush and got out what I could, then filled it up with water, and set it on top of a sauce pan and clean it real good using the clean setting. When you sew a lot there is an awful lot of lint, having fans going can sent that lint just about everywhere.
Canned air would be ok to use, be sure to give it time to dry up before plugging it back in.