Downdraft cooktops give you the best of both worlds: outdoor cooking that's out of the elements. The cooktop has a fan either under the burners or just to the back of them to pull and filter smoke, steam and odors away from the range and out of the house. Cleaning a downdraft cooktop is easy to do, but will be slightly different depending on the make and model of the range. Check the manufacturer owner's manual or contact customer service if you have concerns about the basic cleaning methods.
Clean the exterior stainless steel with a non-abrasive stainless steel cleaner. Apply cleaner to the microfiber cloth and run it along all stainless steel surfaces maintaining contact the entire time to prevent streaks. If you must reapply cleaner, go back over where you finished and continue on.
Fill the sink with hot water and add a squirt of dishwashing liquid to it. Remove the grills from the range and soak them in the soapy hot water. Scrub any grease or caked-on food from the grills with the sponge. Rinse and allow them to air dry before replacing. If you have a grill-free range made of enamel or porcelain, use a clean cloth dampened in the dishwashing water to wipe down the top. Always wipe spills off enamel tops immediately.
Remove the ventilation grate to clean the downdraft ventilation system. Squeeze the tabs holding it in place and pull it away from the unit. Wipe the grate with soapy water or soak it in the soapy water in the sink. Wipe the grease filter with a soapy sponge, removing any grime and build-up. Dry the parts and replace the ventilation grate.