Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

The only thing I have found that works is if it’s a new/available engine, buy an extra burner and keep that one mint    Sorry, but I don’t think you will ever get that clean again.

As for the boiler, Maas/Simichrome and 0000 steel wool will take care of it. Like the burner, those firebox sides will never be perfect on these toaster Mamods after firing.