Verdict at a glance: PrivaZer Pro is one of the most thorough privacy cleaners on the market. It doesn’t just delete files; it overwrites free space to prevent forensic recovery. However, its interface is intimidating, and it runs much slower than competitors like CCleaner. 1. What is PrivaZer Pro? PrivaZer is a Windows privacy cleaner and system optimizer. The Pro version adds priority support, portable use on unlimited PCs (for a single-user license), and automatic updates—but no extra cleaning power over the free version.