A number of barbecue grills are composed of stainless steel for durability and longevity. Stainless steel's bright, shiny surface gives barbecue grills modern appeal and repels food stains, dyes and oils. Leaving stainless steel grills outside and uncovered exposes them to weather conditions that wear away layers of passive chromium oxide. Prolonged exposure can cause metal grills to develop rust spots and eventually deteriorate. Promptly remove rust from the outside of barbecue grills to maintain their appearance and allow them to last longer.
Fill a plastic container with 1 gallon of warm water. Add 2 tbsp. of liquid dish soap to the water to create a soapy solution.
Dampen a microfiber cloth in the solution. Wipe the outside of the grill with the damp cloth to remove dirt, grime and grease.
Rinse the outside of the grill with fresh water. Dry the outside of the grill thoroughly with a terrycloth towel.
Pour white vinegar over the rusted area. Rub a fine steel wool pad over the rust spots in circular motions until they are completely removed. Keep the grill wet with white vinegar while rubbing the surface.
Rinse the outside of the grill with water to remove the rust particles. Dry the grill thoroughly with the terrycloth towel.
Spray the outside of the grill with a coat of heat-resistant paint. Allow the paint to dry according to the manufacturer's directions on the can.