Drying in hot oil. It is a method, which sometimes gives good results, however, it is a troublesome process due to the foaming of the oil and the need to heat the oil baths, which ages quickly and thickens. Oil temperature, usually spindle oil, should be above 100 ° C, heating of the oil to about 120 ° C is used. Wet products, e.g.. after washing away the quench salts, alkaline bath for blackening, immersed in oil, as a result, they are dried and preserved for the period between operations. This process gives good results especially then, when it is necessary to remove water from deep crevices. They are done this way, that the wet parts are immersed in a bath with a liquid with surface properties, the action of which displaces water from the metal surface. Surfactants contained in water-displacing liquids adsorb on the surface of the metal, also protecting it against corrosion for a short period of time. The drying process is carried out in this way, that a metal bathtub with a sloping bottom is poured into e.g.. produced in the country, the so-called: W5 concentrate in an amount up to 8% per liter of kerosene or diesel fuel. Then the wet parts are immersed in the bath and kept there for a few minutes until the bath is completely wetted. Water displaced from the surface sinks to the bottom of the bathtub and can be periodically removed by releasing it with the tap. This method gives good results, especially in the case of unit production of products, which are difficult to dry in dryers due to their weight, the presence of a corrosive liquid film, etc.. It is also expedient to remove the moisture accumulated on the surface of the products in this way, that their surface is wiped several times with Fluidol, The water is bound in the emulsion and the metal is preserved at the same time. This treatment can be used to remove water from small metallic surfaces, e.g.. elements covered with electroplated chrome coating, instrument handles, wet tools, ship deck equipment and weapons, if it is necessary to clean and preserve them .