Cannot delete storage account

I create a new VM in the Preview, which presumably created a Storage account.

I then closed and deleted the VM, but the storage account remained.

When I try and delete it I get:

"Storage account *********** has 1 container(s) which have an active image and/or disk artifacts. Ensure those artifacts are removed from the image repository before deleting this storage account."

There is nothing else showing in the account. Everything is zero.

Is there something else that has to be cleared to remove this?

-c.