Do I have to clean the inner tub GEME? How?

You don't need to clean the GEME after every use.

You can just use the scraper in the kit to clean the attachment on the barrel wall.

If you put in garbage with too long fibers and tangled the mixing shaft, you should take them off and avoid this from happening again.

Cutting them short and putting them in again will make your GEME happier!