Check out this great degreaser called POWER CLEAN XL. I used this degreaser to clean my old Yamaha bike Carburettor. I also used their POWER CLEAN Ultrasonic cleaner - 12 liter capacity. With the power of the ultrasonic mixed with this dynamic, oil / grease killing degreaser, it did wonders. All my oil, grease dirt from the Carburettor was cleaned in minutes. I would strongly recommend this product.