Does anyone have a tried and true method for cleaning calphalon non-stick omelet pan? I've never used pam-type sprays, which I know can leave a residue, and I've always used nylon pads with Dawn or Joy, but I still can't get off grease left over from caramelizing onions, or other cooking adventures. I've also tried Dawn's "Power shot" and oxy-clean. No go. My non-stick pan is not so non-stick anymore, and I'm thinking of reverting to my old cast iron pan, which is heavier, but seems like a lot less work.