You can do this yourself in a couple of minutes. Because servers deploy on demand, the way to get a clean, original-state machine is to delete your VPS and deploy a fresh one:
- Open your server from Services > Servers.
- Click the Delete Server () icon (in the action bar at the top right) and confirm. This erases the VPS and all of its data, so save anything you want to keep first.
- Click the Deploy VPS button and configure a new server with the OS you want. It deploys in under a minute.