Valvoline Cummins Ltd. Presents Power Carb Choke Cleaner. The Power Carb Choke Cleaner contains powerful synthetic cleaners to help restore engine efficiency and reduce gasoline consumption. The quick penetrating formula of the Power Carb Choke Cleaner will clean hard-to-reach clogged passages and surfaces. The Power Carb Choke Cleaner is safe for catalytic converters. The cleaner is available in 15.6 oz packs.