Remove Renamed Application Database

After cleaning up a few of the non friendly Database names that SharePoint installs I noticed that they were still being referenced.
In Central Admin -> Manage Database Upgrade Status you see that the removed databases are still listed and their status is Not Responding.

You can remove them using Powershell using the following command

Get-SPDatabase | Where{$_.Exists -eq $false} | ForEach {$_.Delete()}