How do you clear the cache in safari 6.0?

From your Safari menu bar top of your screen click Safari > Preferences then select the Advanced tab.

Select: Show Develop menu in menu bar

Now from the menu bar again click Develop > Empty Caches

Another way to do this to go back to the menu bar click Safari > Reset Safari > Clear History > Reset.

Apparently that empties the cache but also clears the history as well, just so you are aware.