Corrosive layers and particles can only be removed using special suitable solutions. In order to identify the correct agent and the right method of treatment it is very important to carry out certain preliminary clarifications. Both the intensity of the attack (propagation of corrosion) and the type of attack (corrosion type) need to be analysed as accurately as possible in preliminary. By providing the laboratory with an original component part of a plant or system, it will be possible to determine the most suitable solution. Here it is also important to find the most effective, but not too aggressive medium, to prevent the attack of the base material. It is essential to be highly experienced and to find a highly effective solution. The optimal solution can be offered together with the specific treatment techniques /processes. However, damage caused by corrosion, such as pitting of a component, can no longer be made good.