I know macs are far more robust than pcs but they surely need a clean every so often.

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I have seen many apps such as Mac Keeper, Mac Cleanse, CleanMyMac and more.

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There are certain cases wheres its needed to free up a large spaces on the drive, but not something everyone has to do.

Far as other Mac maintainence, there really isnt any except to backup ones 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 PCs and combines cleaning and scrubbing of the drive if setup correctly.

Check the System Memory tab at the bottom of Activity Monitor to see if you have excessive page outs, a sign that you may benefit from more RAM.

Check if you are running any poor Mac anti-virus programs as they may take large resouces.

If you dont want to do these manually or the above check still wont help, let this utility to clean your Mac and fix relevant issues easily.

Also, regarding one of the apps you mentioned, see Beware MacKeeper.

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