i have a 1/2 bathroom that has a sink that is almost impossible to work under. I can’t get a wrench up there but i can use my hands. unfortunately, the bolt that tightens the faucet to the sink snuggly is under the sink and not turning. It moves up and down but then stops moving at a certain point. I assume there is dirt build-up and have tried using liquid wrench to no success. should i cut the pipe that goes through the sink hole or are there any other tricks? this sink is one where there is the water spout in the center, and then the hot and cold knobs are separate. any thoughts would be great.