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Iconbox has a button labeled "Restore" that puts everything back the way it was. I'm sure Candybar has something very similar. If you do it all manually, then you'd need to keep the original icons and the pngs that make up the dock somewhere, in a folder. The Candybar/Iconbox method is easier.
 
I'm sorry I don't really know that much, but where can I find IconBox? and whats CandyBar?
 
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