Cleanup SRPMS from repository

I’d like to delete source RPMS from my Oracle Linux 6.x and 7.x repositories

I enabled Ignorable Content: Source RPM and Mirror on Sync: Yes but when I synchronize a repository, the source RPMs are still there.

Expected outcome:

Source RPMS should no longer exist in the Library version of the repository after synchronization has occured.

Foreman and Proxy versions:

Foreman 1.18.2

Foreman and Proxy plugin versions:
Katello 3.7.1