I picked up a 2025 engine that needs some cleaning. I have used the dawn and toothbrush method on other engines and it has worked well. The issue I’m having with this engine is that there seems to be a layer of soot or something else that isn’t coming off the tender shell. It definitely has the weathered look going for it, but I was trying to get it a little cleaner than that. I tried a few different cleaners (alcohol, etc) on the inside of the shell but this didn’t remove the coating.
Any advise on what else I can try is appreciated…