QUOTE: MikeV has a recipe for a custom acrylic paint cleaner he makes using windex and simple green and something else, I don't remember the recipe exactly though.
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2 parts distilled water, 1 part Windex, 1 part Simple Green. It works great for me.
I use Model Master acrylics a lot and haven't had that problem, but I seldom leave any paint in the cup for more than an hour or so. Does your paint cup have a cover on it? If not cover it with aluminum foil or something between sessions.
If all else fails try laquer thinner for cleaning the cup out.