I have found some interdental brushes made by Wisdom (a British brand) that have no wire at all. Made of soft plastic, their conical tips are coated with “rubber” teeth. They are perfect for cleaning the tips of airbrushes (even the smallest ones), and are safe for plastic airbrush tips (like Aztek). I use them for other duties as well (like correcting paint on canopies). Look for similar types in a store near you. 

Tip submitted by:
Elias TrapezanlindesHellinkon, Greece