Congrats on the Christmas gift.
I use Testors and Model Master's Enamels, while my wife uses acrylics in our AB's. Although I do not have an Aztek (Iwata's and a Thayer & Chandler) I have been cleaning them with thinner just fine. I also tear them down at the end of the day and give them a nice bath using Q-Tips, paper towels, etc...
Just a word of note: I did notice some of the cheap gallon jugs of paint thinner (mineral spirits) aren't as strong as others. Read the labels, I forget the exact wording, but one referenced itself being more for soaking brushes and general cleaning up. Where most are used for mixing with oil based paint for thinning and cleaning, not just soaking. Anyway, the soaking thinner didn't do much good.