Open Source Mac Cleaner
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.
Beyond simply deleting files, BleachBit includes advanced features such as shredding files to prevent recovery, wiping free disk space to hide traces of files deleted by other applications, and vacuuming Firefox to make it faster. Better than free, BleachBit is open source. Download now. See more screenshots or watch the videos. What is the best software program to buy to clean up my mac? Leave your Mac on one night a month, (not in Sleep mode) so it can run maintenance tasks for you. Read here Mac OS X: About background maintenance tasks. If the drive is slow to respond to tasks, you may need to free up disk space. Oct 11, 2010 Disk Cleaner is a free open source tool to quickly and easily clean your hard disk from temporary files like those in the system temporary folder, the.
Movavi mac cleaner review. Alternatives to AppCleaner for Mac, Windows, PortableApps.com, Linux, Android and more. Filter by license to discover only free or Open Source alternatives. This list contains a total of 25+ apps similar to AppCleaner. List updated: 4/24/2019 12:35:00 PM. The BleachBit source code is copyrighted under the GNU General Public License version 3. Unless otherwise noted, the web page content is licensed under the Creative Commons Attribution-Noncommercial-Share Alike 3.0 license and screenshots of BleachBit as public domain. Stop your Mac getting bogged down with useless files and memory hogging applications. Clean your Mac with one of these best Mac cleaner apps. We show you the best cleanup utility apps for macOS.
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.
Open Source Mac Cleanup
Open Source Clean Mac
For Safari and Flash, this check is more accurate
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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.
If your interested in performance, read my post here