I decided to remove my boil kettle's brass ball valve to get a look inside of it, and clean it. Obviously, my brew-to-brew cleaning procedure needs improvement in the area of the valve, as evidenced by the build up inside the valve. In the future, I think I'll be running boiling water through it after every brew session. But now, since I have the valve in hand, can I boil it out on the stovetop, and see what grime I can remove? Is there a cleanser that I should add to the boiling water? Oxiclean...TSP?