The best way to clean your PC is with a tool that doesn't violate your privacy, doesn't track what you're doing, or force you to buy their plan to remove and clean things.
For example, you can use:
CCleaner to delete obsolete registry files, clean junk and generally clean all the files that are not needed anymore. It features intelligent cookie scanning as well to preserve your login sessions.
Geek Uninstaller to properly uninstall apps and remove their traces.
Both apps are free, except CCLeaner has a PRO mode that adds a few settings (trust me you don't need them, just stick with the free version).