If you want to periodically “de-Google” your computer, to avoid much of its intrusive tracking, it’s important to delete cookies from the “Google network”, over 100 companies and sites that have been purchased by Google, many still operating under their own names, but share data with Google, so it can develop user database information.
http://en.wikipedia.org/wiki/List_of_acquisitions_by_Google
Importantly, many sites are now protecting their cookies from deletion by using other Flash files to back up data, then reload the cookies. Adobe provides a Global Storage Setting Panel that will allow you to delete these as well.
http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager03.html
My flash folder is on my desk top and gets emptied quite often, and I never leave my computer without clearing my history, etc. It’s amazing how fast the flash folder is filled.