This is an essential tool for cleaning your airbrush system I ended up buying this after the fact and will always have one of these in stock

Face it, airbrush cleaning can be a war against drying paint where just more thinner won’t dissolve it. I use both the standard brush for things like bottle threads and the extra fine to carefully and gently dislodge stubborn internal junk. If you are forcing it, you are doing something wrong. Tamiya quality and a gentle touch with both sizes will serve you well.