How do you loosen a stuck bathtub faucet valve? I have an old style bathtub faucet with the three knobs(hot, cold, diverter) and shower head. I DO NOT have access to the faucet from behind the shower wall. I can get to the nut on the valve, but I am afraid if I horse on it I may break something. I was thinking about using a penetrating oil or something to unfreeze the nut. The shower is a tub surround. The faucet is not leaking, but when I turn off the water, the water continues to drip for several seconds and finally stops. I want to replace the seals/washers.