While there’s still some heat in your grill, attach an onion to a fork and rub over the hot bars. The water in the onion steam cleans them and removes any stuck-on food.
Mix 500ml of vinegar and the same amount of water in a spray bottle. Spray the solution onto the grill and leave for 10 minutes. Empty the bottle, refill with vinegar, spray on and then scrub to clean the grill and its interior.
Try soaking your grill and utensils in coffee for hard to remove food remains. The acid in the coffee loosens up the caked-on dirt.
Sprinkle baking soda on the grill and dissolve some in water. Use a sponge with a scourer to scrub until all the baking soda is gone and the grill is sparkling.
Pour half a bottle of beer onto a warm grill and scrub with some newspaper or a wire brush. In no time, your grill will be sparkling.
source: House Beautiful UK