CCleaner
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Full user review
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"Does what is says if you read the directions first"
Pros
FREE!! IF you read the directions first, and take the 5 minutes to get familiar with the control screens, it does what is says it will do -- on both Mac OS X and Windows 7. I cleaned out more than 450MB worth of junk (each) on three separate machines; the oldest a 4.75 yr old Mac Book Pro. Even my three week old Mac Book Pro was faster after I did all the initial set up and data transfers.
Now I run the program every day on my laptop before shutting down for the night; and on my wife's at least once a week.Cons
The directions are not the best, and I almost deleted some items that were program required. BEFORE you delete anything the first time, scroll through all the file names.
Better to have to do it a few times than have to re-install a needed program.Summary
Worth the time and did I mention, it's FREE!!!