Hi Kevin. Can the model be disassembled? If not, I would think you would have to do some serious masking on the windows. You could wash the bus in warm water and Dawn, and let dry. I would paint with a primer first, let that dry, and then paint the finish color with the same paint manufacturer, making sure they were plastic compatible.
I’ve been using Rustoleum plastic compatible rattle cans with good results, as long as you keep the coats light, and follow directions on the can as far as re-painting.
I think some of the other forum members might improve on my advice. Good luck, and let’s see those results!
