Revell's Aqua Color Clean is great for cleaning dried-on paint from your tools. These 100ml bottle retails at $5.99 each.
Aqua Color Mix is a thinner and drying delayer that can help you get the most out of airbrush paint applications. Each bottle is 100ml and retails at $5.99.
Prime your models before painting using Aqua Color Basic to achieve better results. These 25ml bottles retail at $4.99 each.