$WSUS = Get-WsusServer -Name SERVERNAME -PortNumber 8530
Invoke-WsusServerCleanup -UpdateServer $WSUS -CleanupObsoleteComputers -Verbose
Invoke-WsusServerCleanup -UpdateServer $WSUS -CleanupObsoleteUpdates -Verbose
Invoke-WsusServerCleanup -UpdateServer $WSUS -CleanupUnneededContentFiles -Verbose
Invoke-WsusServerCleanup -UpdateServer $WSUS -DeclineExpiredUpdates -Verbose
Invoke-WsusServerCleanup -UpdateServer $WSUS -DeclineSupersededUpdates -Verbose