[MrMoke]

It's probably best to work directly with the network administrators to fix this sort of problem. My district had it setup so that each student was assigned a personal network storage area based on their student ID. This allowed individual workstations to be automatically cleared of miscellaneous junk whenever they were rebooted, including anything saved by students on their workstations. It kept everything clean.
The "save as" and open by browsing file system kept each students files in a protected space.