Please also pay a visit to the FAQ: http://klik.atekon.de/wiki/index.php/User%27s_FAQ

Everything is inside the .cmg file, as a cramfs or zisofs compressed file system image. Deleting the .cmg should be enough.

(Depending on your klik client setup, the temporary staging directory underneath /tmp/klik/ may be kept, not deleted. But today's default behaviour is to delete the staging directory after the .cmg is created.)

Cheers, pipitas