Ryan and Jeremy from Safety King did an excellent job cleaning my 2nd floor dryer vent. Weeks before the appointment, I cleaned it from the inside (behind dryer and separated and cleaned vent pipe running through attic), but realized it is critical to get the whole vent run cleaned from outside exit point using reverse air snake. It was literally snowing lint when they were cleaning it!
They also used an anemometer to check the air flow before and after cleaning and took pictures to highlight the drastic differences before and after. I used a few other companies in the past who would not even clean it from the outside because it was on second floor. Now I will only use Safety King in the future!