I am planning on changing the coolant in my 98 vette. I located the plastic winged drain plug on the passenger side of the radiator and tried to loosen it by hand but it wouldn't budge. Before I broke something I figured I would look through my Helm service manual. The manual says "remove the plug", which isn't too helpful. Do I need a special tool? Will pliers work? Do I turn it clockwise or counterclockwise?