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.
Disk Drill: The best data recovery software for Mac OS X. Recover deleted or lost data from any storage device, iOS and Android. Cleaner is the only free app that offers memory optimization and disk cleaning to help you speed up your Mac. Cleaner is the. Cleaner has a brand. Disk Cleaner Launch Quick Clean from. But the only other options for the Mac are the nice iTubeX 7.8 by a 17 year old genius for only $7.50 for a very fine downloader/mp4 and mp3 converter by a German called ClipGrab 3. The Channel 4 reality TV show, which ran from 2003 to 2009, was a huge hit, attracting more than five million viewers and turning these hitherto unknown women into one of the most popular telly duos.
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.
Dr Cleaner For Mac Review
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Dr Cleaner Pro For Mac
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