The best idea would be to back up the entire disk (using SuperDuper! or Carbon Copy Cloner), wipe it and install a vanilla system. If you're paranoid, you can do a safe erase of all your data before reinstalling. That is the most amount of work, but it also makes sure that your data won't be seen by anybody and that you will be able to restore it to the exact state it is in now when you get it back.
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