How to remove a striped Hex Screw?

I found some M3 12mm contersunk screws in the fleebay, turns out to be half the price from EK postage quote, but not sure about the quality(half quality:confused:)
One is saying 10.9 hardness grade and the other 12.9. Also some are black and some stainless steel.
Now I am assuming 12.9 is better than 10.9, and to get the black ones.
 
So finally removed the frekin Screw!
Used all sorts of things but it was the extra virgin olive oil that did the trick! :)

Thats the only happy part as I found out My cpu block is effected by Nickel flaking issue!

On to RMA! :(
 
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