How to check which Resources on the Cluster have been created or modified by RHACM-Policies?

Issue

Assuming you have created a namespace or any other Kubernetes-Object using the enforce mode of a RHACM-Policy how can we find out that those objects have been created or modified by a Policy?
How can we delete all - or just some specific - Objects which have been created by RHACM-Policies on one or several Clusters?

Note: by design if you delete a Policy in RHACM the resources which have been created by the Policy will not be deleted.