Truck Repair: Clutch, wheel seal, peterbilt

Question
I had a recent engine job performed on my Peterbilt at a smaller local shop.  After a trip I had oil leaking on a rear engine seal.  Mechanic replaced seal and said that some oil leaked onto the clutch.  He said he pressure washed the clutch and re-installed it.  First trip out right now and if I step on the pedal (while trailer is empty) the clutch slips.  Is my clutch shot or is it possible to clean it?

Answer
Your going to have to replace it. Clutch pads are like your brake pads when you have a leaking wheel seal once you get oil soaked into them theres nothing you can do to get it out. With it slipping on you it's already heated up and put a glaze of the pads which is just going to further hinder it from not slipping anymore.