Cleaning an airbrush compressor will mostly consist of cleaning the hose and airbrush attachments. Paint can clot and rust (if metal based) when left over a long period of time. A rule of thumb, always clean your airbrushes the moment you’re done using them. Cleaning these fine brushes is best done with a thin pick and even thinner brushes which can fit inside your airbrush. A great toolkit any airbrush artist should have is the ABEST 3 Set Airbrush Spray Cleaning Repair Tool Kit. You can apply water to your brushes and picks, although with metal components you may risk rust; another option is to use a liquid cleaning agent like the Iwata-Medea Airbrush Cleaner. Some airbrushes can even be broken down and opened up for the most extensive cleaning, and always clean your maintenance tools as well.