crwdns2933423:0crwdne2933423:0
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crwdns2934249:0crwdne2934249:0:

The easy way is to have apple replace your phone.  
However, if you would like to try to remove it your self, look [http://www.youtube.com/watch?gl=AU&hl=en-GB&v=8fF0DF-mbn4|here].

This dust thing appears to be a common issue and is due to the seals being faulty.  
I hope this helps you.
Frank

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open