I’ve been using CCleaner for a couple of years now and it does exactly what it says on the tin. It adds a menu option to the Recycle Bin that allows you to quickly call it up and get it to clean in those hard-to-reach spots in Windows and a good number of different applications that run on it such as Microsoft Office, Opera, eMule and a load more. (It can also be run from your Start Menu or Desktop, I find it handiest on the Recycle Bin.)
Difficult to describe this better than the site itself so I’ll just quote shamelessly:
CCleaner is a freeware system optimization and privacy tool. It removes unused files from your system – allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history.
The next part of their statement can be qualified, however.
But the best part is that it’s fast (normally taking less than a second to run) and contains NO Spyware or Adware! :)
While it is fast enough, it takes rather longer than a second to run on my machine (AMD Athlon 64 4000, 2Gb RAM, 7200rpm hard drives). I can confirm that my machine remains spy-ware free after installation. The installer offers to install Yahoo! toolbar. The option is checked by default and can be unchecked. This, however, is ad-ware, surely. I always uncheck the Yahoo! toolbar option during installation.
However, this is a terrific little util that should become a standard part of your Windows installation and cleaning policy.