CCleaner cleaned up nearly 3G junk files in total! It is really good! The software is completely free and perfectly supports XP to Windows 10.
Have used CCleaner, killed my system once. I heard of a saying that this program also has killed their systems too. But my Win10 currently has no problems.
I’ve been using Windows 10 built-in uninstall function to do cleanup, and then use CClean to do further clean up.