“Why choose Dr. Cleaner?” This is a common question that many people want to ask as there were too many cleanup apps for the Mac and many don’t know which one is the best one or safe to use. However, do not simply believe that there are no viruses or adware found on the macOS. Once you download apps from unknown websites or unidentified developers outside the App Store, there is a big risk that these apps may carry Trojan, viruses, or adware. Also, apps outside the App Store cannot provide a quick update when a new macOS is released. After you upgrade your system, these apps may fail to start or even make the entire system crash.