Crap Cleaner has been released in a new version just a day ago and I decided to take another look at it. I removed all options during installation except the one that would create a start menu entry in Windows - no need for additional toolbars on my system. I especially wanted to take a look at the Issues tab which someone mentioned in the comments sometime ago.
The Issues tab in Crap Cleaner scans the registry for missing shared dlls, activex issues, unused file extensions, obsolete software and many more entries and displays them after finishing the scan. You may then click on fix all issues which prompts to backup your registry before continuing. After that the first issue is displayed with information why Crap Cleaner decided it is one.