Internet Explorer > Tools > Delete browsing history…
Firefox->Tools->Options then tab=Privacy then link “clear your recent history.” After that, check the cache and clear now (see the series of screen shots below to help).
Same as above except first step is FireFox->Preferences under main menu – then tab=privacy
Go to Safari->EmptyCache
If you do not see Safari->Empty Cache, then follow these instructions (at the following link) to turn on “advanced developer tools”: https://discussions.apple.com/thread/4160058?start=0&tstart=0. Then, after that, follow the same pattern as found in Safari 5 to empty your cache