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I just had some good results with Gunk Engine Degrease
Yup, me too. Took a couple of applications but really got the frame and case down to dry metal. Have the engine a little warm and use hot water rinse for best results IMO.
It wont effect paint/hoses, but you have to wash it off with a water hose so just be aware of any electrical parts in the area your cleaning. Of course the bottom of these bikes sees plenty of water throughout their life, so it'll be fine as long as your not aiming directly for electrical components.
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