Terminal Server 2003 client map drives

I have clients that log on to workstation and the logon script correctly maps the drives when they log onto the 2003 terminal server the drives show up as “disconnected network drives” and you can’t remove them from my computer by trying to ‘disconnect’ them nor can you clear them from a CMD prompt. Have tried to modify the logon script to no avail. any suggestions on how to remove the disconnected drives from the client session??