Clean machine with BleachBit
With BleachBit you can free cache, delete cookies, clear Internet history, shred temporary files, delete logs, and discard junk you didn’t even know was there. It is available for Linux, Windows, BlackBerry, Email servers and Mac OS X.
The version of BleachBit in the repositories of many Linux distributions is often stale, so to use the best and latest version, use the packages from the Download page.