What chemical is commonly used to remove deposits from high-pressure boilers?

Ammoniated citric acid is commonly used to remove deposits from high-pressure boilers due to its effectiveness in not only dissolving mineral scale but also being less corrosive than some strong acids. This makes it particularly suitable for the maintenance of boiler components, where a more gentle yet effective cleaning agent is desirable. Its chelating properties allow it to bind with metal ions, facilitating the removal of calcium and magnesium deposits that can build up in boiler systems. This is especially important in high-pressure boilers, where such deposits can significantly affect efficiency and safety.

The other chemicals listed, while they each have uses in various industrial applications, are generally not preferred for this specific task within high-pressure boiler maintenance due to their higher corrosive nature or less effective scale removal properties compared to ammoniated citric acid.