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Well, the screensavers hack is self-contained and the uninstaller should completely get rid of it -- with the caveat that it doesn't delete user-added data (your screensavers collection) unless you "flag for complete uninstall".
The jailbreak also has an uninstaller, which should get rid of the jailbreak.
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As knc1 said, if you really want to make sure you have a pure vanilla Kindle you will have to reset to factory defaults and Kubrick it. Which wipes everything, hacks as well as account details and your books.
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