Steps to clear fresh developer edition org
Why would you want to do this? A better question is why does salesforce clutter a new developer org with custom components you didn't create?-
Go to Setup | Administration Setup | Manage Users | Profiles | System Administrator
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Click Edit
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Under “Custom App Settings”, change the “Default” to something other than Force.com
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Click Save
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Go to Setup | App Setup | Create | Apps
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Delete Force.com
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Go to Setup | App Setup | Create | Tabs
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Delete “Start Here”
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Go to Setup | App Setup | Develop | Pages
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Delete “Start Here”
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Go to Setup | App Setup | Develop | Classes
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Delete startHereController and XMLDom.