Clean your resin brush by first brushing off excess resin on a scrap newspaper.
You will wash your brush in each of the three solvent tanks. In order: A, B, then C.
Clean your brush in the A tank of acetone.
Wipe off the brush on scrap newspaper.
Work the brush back and forth to clean off as much as possible.
Next, clean the brush in the B tank of acetone. Note that this tank is slightly cleaner then the first tank.
Clean the brush between pages of scrap newspaper.
Clean the brush in the C tank of acetone.
As before, brush aggressively on scrap newspaper.
Close all three acetone tanks.
Throw away all dirty newspapers.
Finally, clean your brush throughly with soap and water! Shake excess water out of the brush and store your brush in a warm dry place.