What shall be used for cleaning surfaces plated with chrome/nickel/ non-corrosive steel/other material?

Hard-water build up is best cleaned with a soft cloth soaked with 10% citric acid solution. For daily care you can also use specialised products for cleaning the fittings. Available on the market.

Warning! Don’t use cleaning products containing aggressive components, such as chlorine. Commonly used and advertised liquid and cream cleaners can damage the plating on your fitting!