Cube Stereo - Dirt inside seat tube, causing dropper issues

[Craig24]

Hi all,

Twice now I've had issues with my dropper, when pulling the seatpost out to take a look the actuator is all clogged up with dirt. I don't understand how its getting in? Anyone else had this issue?

 

[Jeffrey]

Did you wash your bike upside down? I got the same issue after doing this once...