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spray silicon down the side runners
Many times it's easier to take the entire trap off rather than the plug. Besides, if you have a toothbrush down there, you will need to do this anyway. Use a pair of channel locks to loosen the big nuts on the U shaped pipe. You may want to get a couple new washers. Bathroom sinks are 1 1/4 inch, Kitchen sinks are 2 inch. The washers are very cheap, I keep extra ones on hand for such circumstances.
It is called covering your butt!
NOT REALLY, BECAUSE THEY ALREADY PAID FOR THAT WORK/.