I'm just guessing at what you are looking for here Mr. pongpeera_nazi:
I think your trying to clean out your airbrush because your paint dried or "cured" inside. This is bad. Once Enamel paints dry, they are supposed to be permanent. Typically you cannot wash them away.
You may have to replace some parts of your airbrush.
Some acrylics can be washed away or cleaned off after drying.
To prevent this from happening again in the future, be sure to properly thin your paint and do not allow it to sit in your airbrush too long.
I typically use Rubbing Alchohol for Acrylics.
Enamel thinner varies based on the manufacturer's reccomendation.
"I love modeling- it keeps me in the cool, dark, and damp basement where I belong"
Current Projects:
1/48th Hasegawa F-14D- 25%
1/48th Tamiya Spitfire- 25%