After a long time in research and development Wilesco is able to present a decalcifying agent for steam boilers. One unit contains a 100 ml bottle of decalcifier and a detailed instructions on how to use it. The boiler should be filled with a mixture of this liquid and water. After leaving for 24 hours to soak emty the boiler and run the engine.
THIS IS NOT A TOY! As it involves a flame it is not for use by anyone under the age of 14.