Comment Safari does clean up after itself. (Score 5, Interesting) 200
There is a "Empty Cache" button under the "Safari" menu.
Before "Empty Cache"
ahze:/private/var/folders/zz/zzzivhrRnAmviuee++31gU+-Ev6/-Caches-/com.apple.Safari ahze$ du -sh
129M .
After "Empty Cache"
ahze:/private/var/folders/zz/zzzivhrRnAmviuee++31gU+-Ev6/-Caches-/com.apple.Safari ahze$ du -sh
32K .