ok well i have never done it personally but this is how my first attempt would be
1/ duplicate the chrome part on a new layer ( to use later )
2/ on a layer below that make a selection of the chrome part and brush it in with the paint brush. brushing some highlights and shadows may help too.
3/ take the duplicate layer created in step 1 and use it for reflections by changing it to soft light or overlay and adjusting opacity.
as i said above im not sure how well this will work but give it a try and let us know
-Niaz
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