But let’s face it, manual optimization requires a specific set of knowledge and is tedious. They assert that everything that a Mac cleaner can do can be done manually. Some generally cast doubt on Mac cleaners. What CleanMyMac X Users Have to Say About it In an article by Malwarebytes, a handful of applications from the App Store, among them were cleaning apps, have been identified to be stealing data from its users. It does not help that downloading software from Mac’s own App Store, which is by and large deemed safe, does not guarantee that an application is secure. With the burgeoning news of computer threats, malware, and security breaches, apprehension over installing Mac cleaners is absolutely warranted. The usual question that crops up is, what are the benefits of using a cleaning app, and most of all, is it safe? You may have heard about or have come across articles advocating the use of Mac cleaning apps.