First things first, here is a list of important applications that can help you neutralize unwanted traces of external storage. [USBDeview] ► Manually remove traces from USB sticks and other external devices [USBOblivion] ► Automatic cleaner that removes every possible trace of inserted external storage [Shellbag Analyzer] ► Remove shellbag keys that contain information about your personal activities like: folder names, paths to folders [including deleted ones]. It is also a good idea to look in the registry to make sure that all traces have been completely removed.