2007 Kia Optima squeking around serpentine belt

I hear squeaking coming from the serpentine belt area. The power steering pump is on top. So I thought it was that. But not sure. I saw a video that showed the same squeaking but I could see the pulley actually skipping. Mine is not doing that and my power steering seems to work fine (no squeaks when turning). I have tried belt dressing, but that made the noise worse for a bit. I tried oiling the pulleys but that just worked while idling. When I push the accelerator, the squeak comes back. Could it be the water pump or its' pulley? Or could it still be the power steering pump?

Thank you