While in Indiana I picked up at Menards a flexible shaft vent brush, made to use with a drill on low speed.
Turn on dryer, run brush from outside, stand to the side 
Look similar to this
https://www.amazon.com/Deflecto-Clea.../dp/B00IB4BMDQ
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Thanks,
Duane
2019 DRV MS 39DBRS3 ---> Flexible Flyer
2020 F-450
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