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

Hi TP and welcome to The Forum. That boiler is brass that has been blued from the factory. If you can
remove the boiler from the base, do it.
The thing I use to clean is ammonia and water in a spray bottle over the sink or outside.
Spritz it and scrub lightly with a tooth brush, repeat and rinse. Then wash it with dish detergent and
water and rinse. Most of those marks will not come off unless you polish or buff it off but that'll
probably take the finish off down to the bare brass. I leave them on mine, like scars of authenticity.
Can you show more pictures from different angels? I want to see what that is out the front and the rear
of the boiler. The boiler should come off pretty easy.
Nice looking little engine, good grab.