It's very simple to use. You click on Clean for a cleaning, click on Registry for the registry cleaning. If you need to remove the program, you click on Service.
CCleaner is not the same as it used to be. Much slower and I find JoshCell uncleaner to be better, quicker, and more comprehensive. I use both though.
Best thing about Piriform is when you install one of their apps., that's all you get. No new home page. No changed search providers. No additional tool bars. No "coupon helper", "shopping saver" pop up BS. Just the app. What a concept.