Since I was just cleaning some brushes from their Sealcoat bath, and I thought I'd pass this on.
Most 'tips' tell you to wrap used shellac brushes in aluminum foil or plastic. The other tip is to resoak them in shellac before reuse. I read a better solution (I think) a long time ago. Clean your brushes in a solution of plain ammonia and water. Maybe add a few drops of dish soap. Soak for a few minutes and rinse. Clean, and like new. The ammonia converts the shellac to some inert substance that just rinses right off. I just put the brush in a jar, add a couple of tablespoons of ammonia, and a few drops of dish soap, and fill with warm water. After a few minutes I dump it, and refill with water. A few swishes, and the brush is rinsed. You can get a gallon of plain ammonia for a couple of dollars.
When I dunk the brush, I slosh some of the solution on my hands and it cleans them right off. No sticky fingers.