I scored 3 free metal gallons of 1980s Coleman stove fuel (white gas, naptha) from a storage unit cleanout. I use butane in my camp stoves, at this point, so it's been put to use in the garage. Man, that stuff works well on greasy stuff like clutch plates. I know it's not great to breathe, so a high-powered fan is a must. Doing the job on the N15CS is a pain, but it was self-inflicted as I read an old manual saying to use motor oil. Nope. Cleaning and ATF, no probs. Oh, and the first time I did the job on a long-derelict set of original grimy plates, I used dollar-store degreaser; it also worked fine, just soaked, rinsed, dried, and hit with some brake cleaner afterwards. But I sorta like a faint whiff of naptha, reminds me of old nights camping.