Removing a BIG-IP from BIG-IQ

I have removed a BIG-IP from BIG-IQ. When I go to the Configuration tab in BIG-IQ, there are still items under Profiles, iRules, Certificates, etc. that are from the removed device. How do I clear all those items out? It won't let me select all items and delete them. For example, under Profiles, I select all the profiles listed, but the Delete button remains greyed out.