Dryer vent cleaning, massive amount of lint, completely fills the vacuum!

This customer had just replaced their dryer due to malfunctions caused by the massive amount of lint buildup in the dryer vent. I rarely run across dryer vents that are this packed with lint that hasn’t started absorbing moisture from the dryer though. When the lint is still dry it’s pretty easy to get out as you can see in the video. I just let the dryer run so that there was constant airflow through the duct line and use the brush to loosen the lint from the duct wall. As soon as it’s loosened the dryers own air blows the lint right out!