This is what $6 and a can of GM Top Engine Cleaner will get you.  At this point my car had 147k.  I would have saved my $6 if I knew it would only last another 1000 miles :(  I used two cans on my car to get it all out.  It still smoked after the second can but I figured it was good enough.  Directions are on the can.  It is availabe from GM or from local parts stores, but make sure that you get the AC Delco stuff, the rest is crap !!!
Make sure that nothing you care about keeping clean is anywhere near the car or where the wind is blowing  :)
               (Pets, fences, other cars, etc.)
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