A method uses a high density compressed liquefied gas in cleaning applications in a closed recycle system to achieve effective and economical cleaning without using any high pressure generating device. The closed recycle system can include a pressure cleaning vessel provided with a plurality of nozzles for pre-cleaning, atmospheric containers for expanding compressed liquid, sound wave generators and an agitator. The system can also include a pressure recovery vessel provided at a lower portion than the pressure cleaning vessel and having a detachable drain cylinder suspended from under the pressure recovery vessel and also having a temperature regulator for receiving contaminated liquid that has been pre-cleaned from a pressure cleaning room. The pressure recovery vessel can be connected with a high density compressed liquefied gas supply cylinder through communication with vapor therein to eliminate enriched liquid with contaminants through the drain cylinder as well as removing and transferring solvent by the vapor occurred from the temperature regulator.