Vinegar wins again. I was replacing a few floor tiles. I uses a floor patch that is sort like a cement. I used a old paint brush to feather the edges. The floor patch dried on the brush and parts became hard. I did not want to throw my $1.00 brush away. I am a bit thrifty. It has many other uses to come. I soaked in vinegar water for a day and the brush cleaned up, no more dried floor patch. I will get a few more years out of my paint brush.
It's always good to clean your paint brushes after each use but if you forget and the paint dries on the brush you still may be able to salvage the brush. Just soak the brush over night in cleaning solvent for the type of paint you used. If you used water soluble paint, soak the brush in water. If you used oil paint, soak the brush in turpentine. The paint can should tell you what solvent should be used.
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Murphy Oil Soap for Cleaning Paint Brushes