After disassembling your gun it’s time to clean the metal parts. As mentioned before: take care not to damage anything!
First spray all parts with a good gun oil like
Ballistol® and let soak for at least two days. This oil will dissolve lead- and powder deposits in the barrel and chambers.
After this treatment all parts have to be cleaned using a soft cloth. Next these parts will be immersed in a hot (80 °C) ultrasonic bath for one hour.

Professional ultrasonic cleaner

Accumulated dirt is shaken loose by high-frequency vibrations without damaging the gun parts. A strong detergent has been added to the water in the ultrasonic bath. After this treatment all parts are rinsed in hot water, dried and treated with gun oil.