3 TRICKS TO CLEAN GUNKY BUILDUP ON A FLAT IRON: 1) BAKING SODA + HYDROGEN PEROXIDE + ELBOW GREASE 2) NAIL POLISH REMOVER 3) RUN A DRYER SHEET THROUGH IT ON A LOW HEAT SETTING. (OR JUST TRY RUBBING ALCOHOL IT WORKS ALSO!)
Are Your Cleaning Products Really "Clean?" - Recipes to Help You Clean
Ammonia for cleaning burners: Put a little ammonia and one of the removable burners in a ziplock bag and leave them overnight. The fumes from the ammonia will loosen the gunk, and you can wipe them down in the morning. I have done this and it works great!