Let the cooktop cool completely before you treat the burned liquid stain.
Clean the burned stain with mild dish soap and warm water. Scrub the stain with a nonabrasive sponge to remove as much of it as possible.
Dampen a paper towel with warm water, and sprinkle baking soda over the stubborn stain to remove it. Scrub the stain to remove it.
Apply a cooktop cleaner to a nonabrasive sponge or washcloth if the liquid stain remains. Follow the directions on the cooktop cleaner before you use it.
Soak a paper towel in water, and place it over the liquid stain if it remains. Allow the paper towel to sit for 30 minutes. Then, scrub the cooktop area with a nonabrasive sponge.
Remove thick liquid stains from the surface with a razor blade. Hold the blade at a 30-degree angle to prevent scratching the cooktop. Scrape the area off the stovetop carefully.