The lint DOES get
through the screen and slowly builds up along the walls of the
vent from the screen to the outside opening. Clean it at least
once a year! This packed down lint can easily become over
heated & combust into a fire! Remove the lint screen - then
place your crevice tool on your vacuum wand end and vacuum as
far down and around the dryer drum & the vent pipe opening all
the way to the outside vent. Then remove the back vent tube or
accordion plastic tube and thoroughly clean that out. I replace
the plastic accordion tube because it is cheap to buy and it's
hard to clean out all those creases and folds.
Do NOT run the dryer when you are NOT at home.