Wait until the grates cool down completely after cooking.
Fill the kitchen sink with hot water. Add a three to five drops of dish soap and mix well.
Pick up the grates from the stove top and submerge them in the hot, soapy water. Scrub them with a rag to remove all visible signs of caked-on food or grease.
Rinse the grates well under warm water. Dry completely before placing them back on the stove.
Soak the grates in ammonia water if they have heavy buildup that won’t come off with soapy water. Put the grates in a large bucket or bowl and cover them with warm water. Add 1/4 cup ammonia. Cover the container and let the grates soak overnight. Wash the grates in hot, soapy water the next day and rinse and dry them well.