Audi A4 rear sunroof drain cleaning, applicable to most Audis

Had my passenger side sunroof drain leak water onto the headliner and rear seats. This is the easy method to free the clog up from the bottom up because the entrance is not accessible without lowering the headliner. Tools used Auto Sunroof Cleaning Tool T25 Torx bit Impact wrench with 17mm socket for lug nuts Power ratchet