(12) 20 oz. cans. This effective cleaner is safe to use on porcelain, glass, ceramics, stainless steel, and cast-iron surfaces. Keep spray or drippings away from the pilot lights, electrical connections, switches, receptacles, thermostats, heating elements, light bulbs, and other surfaces which might be affected by caustics. Spray on & clean off. Works in minutes or overnight. Thick gel application clings to vertical surfaces. Warm or cold ovens. No scraping.