close the valves to that cylinder. It's pretty easy to see. Then I used carb cleaner and sprayed the ports. There was probably an inch of fluid resting in the ports. Took my old tooth brush and scrubbed the walls. Took my older spare toothbrush I used for getting wax out of the cracks, and heated it placing a bend at the end. Then was able to scrub the backs of the valves. Then used paper towels to remove the fluid by wicking with the towel rolled up.