Answered by John Neal, December 22, 2021 at 05:15:25 PM EST.
A: Yes! Paste is a blend of starch and pva (and perhaps similar compounds). Dried starch paste cleans up with water, but PVA dries waterproof. Yes! will likely not come out with just water, but you could start with warm water and see if it works. Masters Brush Cleaner is used to remove dried acrylic paint from brushes; it might work with Yes! Both Alcohol and Ammonia break down bonds in acrylic binders. You might try some sudsy ammonia in water. I don't know how ammonia would affect your brush.
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