How can I get dried acrylic craft paint out of the brushes?

I forgot to clean out my paint brushes after finishing a craft. They dried out and are hard as rocks. I've tried soaking them in hot water, added dish soap, but it only took out a little bit of the hard paint. I don't have access to kerosene, gas, etc. which someone suggested as I live in an apt. Any ideas would be appreciated.

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