Cleaning a bike sprocket ?

Soldato
Joined
11 Oct 2005
Posts
5,712
Location
Derbyshire
Hi, just giving my bike a good old fettle and trying to get the chain clean and free of any gunk.

But my rear sprocket. How do I get this clean and the dark bits off?
or dont i.
Thanks.
IMG00831-20110311-2319.jpg

IMG00829-20110311-2318.jpg


Ps: not come out to bad those photos, taken on a Blackberry 8900
 
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