Wise Disk Cleaner
A newer version of Wise Disk Cleaner is available.Or, Learn More About Wise Disk Cleaner
Full user review
"Cleans up but no real performance boost."
It cleans things up really well. No spyware included with it's download.
Doesn't really improve anything performance wise. I haven't noticed much of a difference even though it seems to find a lot of junk files.
I do recommend it to anyone who wants to try it out. It's a clean install and clean uninstall so it doesn't hurt to give it a whirl.
I personally could take it OR leave it.