Windows only: System cleaning utility Moo0 DiskCleaner's dead-simple interface makes short work of clearing out all those unwanted temporary files, cookies, browser history and MRU lists.
Once you've installed and launched the application, just check the boxes for everything you'd like to clean up and click the Clean Now! button. There's not a whole lot of other functionalities, other than the ability to change the application skin, and set it to clean automatically when your system starts up. Still, if you're looking for an extremely simple tool to handle your system cleaning, it might be the right choice for you.
Moo0 DiskCleaner is free for Windows systems only. Readers should probably note that the well-known and popular CCleaner application is not only a lot more powerful, but also has an option to clean at startup buried in the Options menu.