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

Keith Appleton mentions killrock k or kettle descaler? In the US it's called CLR. Calcium, Lime, and Rust. Does wonders on cleaning out these boilers. I have used it for years in scaled up boilers. I fill the boiler with it and let it set for a few hours, depending on calcium deposits, pour it out, and then flush the boiler with tap water and dish detergent a few times. Then I only use distilled water to run my engines. Never had problems thereafter.