Check out this list of features list from http://www.ccleaner.com/features
Cleans the following Windows components:
- Internet Explorer: Temporary File Cache, URL History, Cookies, Hidden Index.dat files, Last download file location
- Firefox: Temporary File Cache, URL History, Cookies, Download manager
- Recycle Bin
- Windows Temporary files
- Windows Log files
- Recent Documents (on the Start Menu)
- Run history (on the Start Menu)
- Windows XP Search Assistant history
- Windows XP old Prefetch data
- Windows memory dumps after crashes
- Chkdsk file fragments
- and more..
Best of all. It's free for personal use!