I get a Buell XB12R that has been in the garage for 9 years, is fine again and the inside of the throttle body was badly blackened on it. Using typical carburetor cleaners made the polished surfaces nice and bright again, but not the rest of the cabin. I soaked it in Berryman's overnight and voila! Everything is nice and fresh again. I only need a toothbrush to clean the interior, but it all came off right away. Looks brand new. Apparently they took note of the reports of leaking or opening jars because they came with a hard plastic rim to prevent the jar from opening. The removal was the most difficult part of the whole operation. I definitely recommend this product.