D255 - Want to remove gmail details

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http://androidforums.com – Hi all Hoping someone here can help. I brought a Acer Aspire D255 about 18 months ago, and generally i've been quite happy with it (once i upgraded the RAM). But its time to move one and i've replaced it with a Nexus7 as i only need it for email and entertainment while on train. So i'm looking at selling the D255 on fleabay, but before i can i want/need to remove any personal data of the device. I have removed everything of the Win7 partition but my gmail account details are still appearing on the Droid partition and i cant find anything to remove it with. Can anyone help? (General)