If the area around your gas range burner is discolored, there are several fixes. Most equipment and supplies you will already have around your home.
Step 1 - Protect Your Stove
You need to keep in mind the enamel finish on your appliance as you set about to clean any discolorations. Enamel can scratch easily, so use a gentle to moderate touch when you scour. Don't use strong cleaners such as oven cleaner on the enamel surface because strong cleaners can ruin it.
Step 2 - Remove the Discoloration
If the discoloration is on a removable burner pan, remove the pan and take it to your sink. Run water on it, then sprinkle on the baking soda. Use a sponge to scour with the baking soda until you remove the discoloration on your gas range burner. If the baking soda doesn't remove all of the discoloration, try using a soap pad, especially if the burner pan is chrome or shiny metal.
If the discoloration is on the stove itself, between burners, the same techniques will usually work. If your stove has a continuous pilot light and the area is hot, blow out the pilot light before you begin. Then use the baking soda technique or the soap pad to gently scour away the discoloration.