Abstract: The invention relates to a method for cleaning coked cavities, in particular inlet, channels (10) and valves (15) of an internal combustion engine (12), comprising the following steps: introducing an alkaline liquid into a cavity to be cleaned; heating the alkaline liquid; and extracting the alkaline liquid and the dirt particles contained therein by suction from the cavity. Said method can be carried out especially simply and effectively using a device comprising a first probe (21), which is provided at the leading end thereof with one or more nozzles (23) for injecting an alkaline liquid into the cavity to be cleaned and which is connected at the other end thereof to the delivery side (24) of a pump (25), wherein warmed alkaline liquid can be supplied to the intake side (26) of said pump. A second probe (22) is provided for extracting the alkaline fluid and the dirt particles contained therein by suction from the cavity.

Abstract: A surface disinfectant and cleaning composition includes (a) a biocidal agent selected from the group consisting of glyoxal, glutaraldehyde, and mixtures thereof, (b) 0.001 to 1% by weight of a fluoroaliphatic tenside selected from the group consisting of perfluoroalkanoic acids wherein the alkane residue has 1 to 10 carbon atoms, alkali and ammonium salts thereof, and mixtures thereof, (c) 0.002 to 5% by weight of at least one ultraviolet absorber, (d) 0.001 to 3% by weight of an optical brightener selected from the group consisting of benzotriazole derivatives, stilbene disulfonic acid derivatives, and mixtures thereof, and (e) a solvent selected from the group consisting of water, water-soluble alcohols, and mixtures thereof, and having a pH value of 2.5 to 5.0.

Abstract: An additive for liquefied hydrocarbon fuel containsa) 30-60 volume percent of at least one nitrogen-containing solvent,b) 30-60 volume percent of at least one nitrogen-containing dispersing agent,c) 0.5-10 volume percent of a nitrogen-containing corrosion inhibiting agent andd) 0.5-10 volume percent of at least one oxidation inhibitor, wherein the sum of ingredients a, b, c and d is 100 volume percent. This additive protects against corrosion, aging, separation of materials on motor parts and purification of the exhaust gas in motors using liquefied hydrocarbon fuels.

Abstract: The invention relates to a liquid fuel mixture, comprising a C.sub.3 and/or at least a C.sub.4 -alkane, at least one oil component and optionally at least one additive, a process for its preparation and its use for two-stroke engines.

Abstract: A process, an apparatus and an agent for the continuous supply of internal combustion engines and/or auxiliary devices thereof with additives are described, the additive being metered continuously into a line, in which an excess liquid operating agent of the combustion engine and/or the auxiliary device is returned to a supply tank.