![Cleaner Cleaner](/uploads/1/2/6/4/126426506/630143513.png)
Fixed Saved Passwords not being cleaned in Firefox v80; Accessibility. Greatly improved support for NVDA and JAWS screen readers so that people with visual impairment who use assistive technology can navigate quickly and intuitively through the app. Cleaner-App is a cleaning software tool that organizes and optimizes disk space usage, creating more free storage space on your Mac. Whether duplicate files are taking up precious disk space, your startup disk is full, or you want to see what’s taking up space on your Mac, Cleaner-App provides the best.
Mac's don't need defragging as OS X automatically writes 2Gb or below sized files to one contiguous space on the drive. There are certain cases where's it's needed to free up a large spaces on the drive, but not something everyone has to do.
Far as other Mac maintainence, there really isn't any except to backup one's files regularly. Keeping Software Updated and run a web browser check to make sure the plug-ins are current.
For Safari and Flash, this check is more accurate
Most of those cleaning programs are junk, especially MacKeeper.
If your friend got onto your computer and visited a bunch of adult sites, then I would recommend something like OnyX, doing ALL the cleaning and maintenance aspects and rebooting, perhaps followed by a Disk Utility Erase free space.
CCleaner beta is out for OS X, used on PC's and combines cleaning and scrubbing of the drive if setup correctly.
Best Cleaner For Mac Free
If your interested in performance, read my post here