Have fun with this one......... I overfilled my PS reservoir last spring (never have a conversation with your wife while filling fluids BTW) and had a bunch blow back all over the pulley's and belt I have been rinsing, powerwashing, soaking in engine degrease just about every two weeks for the past year and she still tends to scream like a bat out of hell whenever she gets a little wet, and I apply a few RPM's to it. the good news is it is getting better. I would suggest talking to the parts store and if it was a bad part discuss them paying for a new belt and engine shampoo as that fluid is really hard to get off, the under side of my hood is still stained despite all the washing I have done.