registry cleaner

Here are a few questions to consider;
1.) What do programs put in the registry, and why?
2.) What are these tools "cleaning" from the registry, and why?
3.) What happens if a registry item that is rarely or never called remains in the registry?

If you answered all three of these, I dont think you will still be looking for a tool, but to each his/her own..

I can put a key anywhere in the registry for later use, then call on it when needed, it can be pointing to a path/file that doesn't yet exist that I will later create when referenced. Would a cleaning tool remove this because its a "broken path"?? Be careful with tools that do anything with registry items, especially ones claiming to "clean" your currently working system. Even if it were only system keys that they are sure of, who knows what MS will change in the next update. Also cleaning "unused"(lol) file extensions can break file associations, etc (CCleaner has a non malicious reputation, but for modern computers best to leave the registry alone, there is literally zero noticable benefit, unless your machine 15+yrs old, even then, what keys did it clean?)

My problem is with Windows not cleaning up after itself when an app is uninstalled. I uninstalled Xbox and there are more than 2,000 entries left in the registry. With all the Windows 10 apps that I have uninstalled, there are over 3,000 entries and the only way to remove them is manually, CCleaner and no other registry cleaner will find them because they are UWP apps.