I use CCleaner and I strongly recommend you do, too. That's because the free utility scrubs your system and removes computer-clogging junk, including files in the temp folder and Internet cache. Download a copy here.
What makes CCleaner so cool is that you can customize it so the tool deletes specific files and folders every time it runs. For instance, I have a junk folder that I use for files I need for the day, but definitely want cleared out when I run CCleaner.
Customizing is easy. Choose the Options icon on the left, click Include, and add a file or folder using the buttons on the right.

It takes seconds to customize CCleaner
Another handy trick is in Settings: Add a "run CCleaner" context menu to your Recycle Bin icon. That way you don't even have to open CCleaner -- just click "run CCleaner from the Recycle Bin Icon.
Update: My friend Michael M., From Texas, just wrote:
"After CCleaner appeared in a print column recently, I gave it a try. In the process, I lost some valuable toolbar buttons in Word that I've never been able to recover. I've tried everything I can think of to recover the lost customizations without success."Though I can't positively say that the loss is the direct result of using CCleaner, I can tell you that my Word customizations worked perfectly the day before I ran CCleaner, and no longer worked an hour after running it. I admit that this may have been a unique problem..."
You can stop CCleaner from touching any of the Office app by unchecking the Office box (see the screen capture below).

Talkback
Have something cool you do with CCleaner? Tell me about it in Comments below or if you'd prefer, fire an e-mail right into my inbox.