How to delete vCloud Director SHADOW-VM using PowerCLI

Does anyone know how to delete a shadow-vm using PowerCLI?

After creating a vApp Template, we copy it across to other datastores (this step is scripted already). However, doing the copy, creates shadow VMs under the source vApp Template (40x VMs for our environment), however we have been unable to script the deletion of these shadow VMs following the completion of the copy.

Any help would be appreciated.

Thanks

Darren