That grinder holds a lot of grinds, as youve noticed.
Theres cleaning and theres cleaning.
I suggest a full clean every week.
Do you want stale coffee grinds mixed in with your fresh?
Where have you noticed the build up?
For me it was around the exit chute.
The best way I found to keep it as clear as possible was to slap the grinder on its back as it ground the last of the beans and to tap it up and down on the bench as well.
The instruction book will guide you for a full clean.
I suggest using it normally for a week and then pull it apart for a clean.
Then youll know whats been happening as far as grounds build up.