Hi
I've used the registry checker in CCleaner for years, I run it at least a couple of times a week, and always after uninstalling any software and it has never caused me any problems.
It usually does find leftovers after uninstalling something and occasionally some other issues.
I always do the backup the registry option, but I've never in more then ten years restored it.
I will say that CCleaner is the only registry cleaner that I use, and trust.
You can always run it and see what it finds, it won't go ahead and remove the entries until you tell it to.
I'm always interested to see what it finds, and can usually identify most of the things that it's removing.
Here's a scan that I just did...
Link Removed
Mike