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There are several remedies people try for this.
1. Commercial brush cleaner. This is especially good if the paint has not yet dried.
2. Vodka...yep rub it in.
3. nail polish remover...but check the fabric can handle it first.
4. Kiss off Stain remover...this works well too.
Above all else the golden rule is get it off before it dries if you can....and before it cures is the next best option. Then think...should I have worn an apron!