MapServer Help - Clearing browser cache
Close the MapServer tab and then hold down "Control-Shift-Delete" simultaneously and it will bring up a dialog box for clearing the cache on most browsers. (except Safari)
By being selective about what is deleted we are ensuring that saved passwords. etc. are not lost.
Internet Explorer The ONLY thing that should be checked is "Temporary Internet Files".
Fire Fox The ONLY thing that should be checked is "Cache" making sure the time range to clear is "everything".
Chrome The ONLY thing that should be checked is "Cached images and files". Make sure that you select "the beginning of time" in the "clear the following items from" drop-down menu.