How to easily clean gas stove grates to make them look like new again?

White vinegar: the hero for stubborn stains

1. Place your  plates  in a container ( or a large basin );
2. Cover with hot white vinegar, add  coarse salt , then sprinkle with baking soda;
3. Leave to stand for a few hours ( or overnight if necessary );
4. A good swipe with an abrasive sponge or  old toothbrush , and the stains disappear  almost effortlessly .

Little bonus: vinegar also neutralizes bad odors.  Double win!