Just create a Task Bundle with a task of "Remove iOS Profile". Then select the appropriate profile you want to remove, save it, and then deploy it to the group.
Well, that worked fine for SMC4. But how can i remove an iOS-Profile from 180 iPads under SMC5? The way I was told in the last webinar was wrong. I do not want to open all 180 Devices and choose that action one by one!