Well from what I read a lot of people use windex to clean out there airbrushes after shooting Future. I use rubbing alchohol. Then I flush out the rubbing alchohol by shooting tap water thru it. From what I read ammonia can mess up an airbrush if you don't flush it out.
Future is very useful. You can use it before applying decals, you can an seal off your paint prior to weathering, you can dip your canopies into it to get a high gloss... I prob missed a few other things.