As said above, airbrush thinner is just for acrylic paints like Vallejo or Citadel, and it's usually acetone based. Basically nail polish remover and won't do anything to enamels or oils.
Odorless thinner is the best you can go for really. Sansodor is the same thing, but you'll find it in any art supply shop and it's typically a lot cheaper than Miniature branded Odorless thinner.
You can use white spirits too, but that will stink the place up so make sure you have good ventilation. Which you should have if you're airbrushing enamels because they are not one of your five a day.