X5S/S is a liquid alkaline formulation, suitable to be used with hard waters, for the recovery cleaning of closed lines subject to heat exchange in the food and dairy industry. X5S/S is able to easily remove organic and inorganic residues from surfaces, while the presence of controllers of the water hardness enables to work also with waters with a high content of salts. The formulation enables to postpone over time the acid descaling stage. The absence of surfactants enables to reduce the polluting charge which goes to the drains. X5S/S is particularly suitable for the single phase washings where a particular anti-bonding action is necessary, such as in the case of the washing of butter churns, where it will be possible to carry out hot treatments and treatments in combination with additives with a biocide action.