This will work for latex, acrylic ... Here are a few tips you can try to remove dried paint from your brushes. Fill a small bucket with a few drops of liquid soap and warm water.
Try to clean your brushes and rollers as soon as you finish painting, says Ryan Parr, founder of Nashville Painting ...
Oil paint can be messy. If cleanup is put off, it gets harder and harder (and can even ruin your paint brushes).
If the latex or oil paint spill is large, it may be impossible to remove all ... a soft-bristled brush—an old toothbrush works great—in the solution and saturate the dried paint stain.