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

Hey Paul, I've seen water get milky from a little oil mixed in it. I suppose a new boiler could have impurities inside from manufacturing
that didn't get flushed out properly, like flux.
Are you using distilled water or municipal tap water? Sometimes a city water works has to dump in chemicals with a chlorine base.
First thing I would try is just some good old dish soap and water, about a third full and shaken, not stirred, then rinsed well.
That's the best I got for you bud.