I am enlisted in the United States ARMY. I do computer tutorials for both MAC and PC. Please check out my Youtube account: USComputerGeek. If you have any requests for a tutorial on how to do something on either the MAC or Windows PC then email me at: computergeek017@yahoo
Like I said, don't watch that kid's video. It takes to long to do his process of clearing the cashe.
Download CCleaner off the app store on your mac (IT IS FREE). It will save you ass loads of time that you could use doing something else.
Here is the link to the kid's video: Youtube.com