Answer
To remove hard or sticky & rusty stains from non-stick pan or griddles or any pot, mix two tablespoons baking powder, One and a half cups chlorine bleach and a cup of water. Put the Mixture in the stained griddle and let it boil for about 10 minutes (don't allow the mixture to boil over or it might leave spots on the exterior finish of the pot) .Wash with soap and lukewarm water. Dry, and then rub a little vegetable oil on the surface.