Power steering pump

My car has being having this chirping sound since I replaced the alternator and now I look at the power steering pump just behind the pulley its covered with oil residue. I know the chirping noise is coming from either the power steering pump or the alternator. The noise goes away when I spray water I tried spraying soapy water on the belt to see if maybe the belt was duty with oil, but it keeps doing the same thing. I do not know if I have a bad pump or bad belt.