I've used Ccleaner for several years, it appears to do what I've paid for. That said, Windows has similar features already built into their software.
Through emails with their customer support team (different individuals each time), I received an "offer" of 50% off upon renewal. When I went to renew I was NOT given the discount offered. So I contacted the company (good luck getting connected). When they finally replied, I was given some twisted justification but no REAL 50% off discount.
We went back and forth a few times, in the end they offered me a "special discount just for me" of 30% off for all my trouble and inconvenience. Yep, first they offered "50%" off, did not actually provide that discount - and after weeks of aggravation they offered me a "special discount" of only 30% - 20% LESS than originally offered for misleading me in their falsely advertised discount offer.
I will not use them again and I suggest everyone else not accept false advertising from anyone.