I would not it soak in nitro fuel. The oil in the fuel normally is what's making it slip to begin with. WD-40 does work good and a DA bath is also good. Soak in DA then with a paper tower clean the inside of the rollers, soak....clean....repeat until there is no more crud in it then lightly lube with WD-40. Be sure to clean out the rotorstart or pullstart housing of any residual oil and grime too.