I've found CCleaner to be too aggressive at times. It also invades your computer like a virus. It's gotten worse since Avast acquired it. It does have a good disk wiper I used to use but I would not leave it installed on my computer. When I would install it to wipe a disk, I had to go through and disable everything except the disk wiper. I would then install it when done. Since I now use only SSDs, I will never use it again.
Glary Utilities has a non-aggressive and non-invasive Registry cleaner that will clean out registry entries left over from removed programs, temp files that are no longer needed, etc. along with a few other utilities you can choose from (most of which I don't use). I've been using it for years without any problems.