Method of washing objects, such as turbine compressors

A method of washing turbine compressors, which operate with large quantities of air and therefore become internally soiled by and coated with contaminants carried by the air, therewith giving rise to greater fuel consumption, higher temperatures and higher emissions with substantially impaired efficiency as a result thereof, wherein small quantities of finely-divided liquid are sprayed onto and through the turbine compressors, characterized by running the turbine compressors and spraying the finely-divided liquid quantities through at least one nozzle towards and through the turbine compressor at an overpressure within the range of 50-80 bars and at a liquid particle size in the range of 250-120 .mu.m, and with a total volumetric flow through the nozzle or nozzles within the range of 0.5-60 l/min., and with a liquid particle velocity of 100-126 m/sec., whereby the liquid is finely-divided to a degree at which the particles of liquid will follow the same routes through the turbine compressor as those previously taken by the air-borne contaminants, when spraying said liquid onto and through said turbine compressor.