If you make heavy (or even typical) use of your computer, you’ll often notice that it just doesn’t seem as fast as it once was. For a slight increase in performance, disk space and to generally remove some of the ‘temporary’ files/cruft that are routinely written to disk you have a few options.
Here are a few of my current favorites for doing ‘Spring Cleaning’ on my computers… BleachBit and CCleaner
BleachBit is available on all major platforms (Windows, OS/X, Linux).