How do I clean a George Foreman grill?
Deglazing is the easy way that I've found over the years:


Unplug the grill, but don't give it a chance to cool down.
Drip water along the top edge of the grill (squeeze from a sponge, or a soaked paper towel).
You should see the water turn murky brown as the stuff releases ... if it doesn't, add more water.
After 20-30 seconds or so, wipe it down.


It's a bit more difficult to clean the top ... you have to learn it back.  You can also wipe it down with a soaking wet paper towel.

You might have to scrub a little bit, but the water should get off the majority of the gunk.  Beware that you'll tear up paper towels on the little nubs at the bottom edge of the lower part ... I typically save that area for last, as anything to clean above it would drip back down there anyway.

Also, if the grill cools off too much, you might need to let it re-warm some.