FS2002/FS2004 GAU Cleaner 4.0. Anytime you install a panel, a lot of .GAU files are copied into the GAUGES directory of your Flight Simulator. Then when you delete a panel, a consistent number of gauges still remains in your hard disk. GAU Cleaner will help you to remove these unused gauges. It can find missing gauges too. By Nicola Marangon. Shareware.