Jason
I use both Tamiya acrylics and Humbrol enamels through my airbrush and all I use to clean it is lacquer thinner that I bought in a 4 litre tin at the local hardware. Cost about $14 AUS and cleans whatever paint is used.
My airbrush is double action - some no name brand I picked up on ebay for about $80 - and the only "trick" I have learned is to be carefulk if you clean it with pipe cleaners. The ones you buy in craft shops lose their bloody hair and you finish up with a hairball in the air/paint mixing chamber and then have to try and pick it out with shaved toothpicks.
Still you live and learn.
Brian