Thru Apple menu in safari
I'm not familiar with that. Can you please post a screen shot? Perhaps the Apple menu is different while Safari 5 is active, I don't remember.
In later OSes, there
is an "Empty caches" menu item in Safari,
if you enable the Develop menu. That's the suggestion and instructions in all three of the links I listed. You'll have to enable that in Safari Prefs, if it is available in your OS.
To get a new version of any web page, any browser will have to actually download the page again. But it will first try to use the page it last downloaded and stored in the browser's cache (memory), even if that page is corrupt/damaged or has old historical data.