A neat trick to clean your dryer vent is to take a leaf blower and blast it through your dryer vent.
Do it from inside you home to the outside.
If you in fact have a lot of a lint you're going to need some on the outside to unclog it ,if it gets trapped by the outside vent.
If there's too much pressure good chance some of the vents especially if it's connected with elbows and other pieces will come apart.
Try it and report back. Good luck.