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DISC: Drilling out a bolt.

I am trying to drill out a 6 mm bolt that broke off.  I have tried
high speed drill bits and I have tried cobalt drill bits.  Nothing
works.  I feel like the drill is spinning the wrong way (yes, I
checked this) as I slowly polish the hole deeper.  The drill bits
still feel sharp.  I have tried 3-IN-ONE, Liquid Wrench, WD-40, and
water as cutting fluids and neither makes a difference.  Does anyone
know what I can do?

These bolts hold my splash shields on.  There was a discussion last
week or so about their usefulness, well my CV joint boot ripped and
is spewing grease all over.  The splash shield helps protect the
brakes from getting greasy.

Don Hoefer
'82 Coupe