I agree, good ventilation is essential. A good respirator mask is also a wise investment.
My personal favorite for clearing acrylic based coatings out of my airbrush is isopropyl alcohol. This should be readily available in any pharmacy right near the rubbing alcohol and hydrogen peroxide.
If your paint or Future is stil fresh in the workings of your brush, then a 50-50 mix of the alcohol and hottest tap water should do the trick.
If its dried on, or getting tacky, break down your airbrush and soak the components in straight alcohol. leave them for an hour or so and rinse them off under hottest tap water.
Hope that works for you!