Truck Repair: oil leak, power stroke, steam cleaner

Question
I have f250 power stroke we have put 2 rear main seals in it still have leak some one said it may be coming from top at the back of motor making it look like main seal is leaking  

Answer
I have seen where oil leaking does run down the pass side looking but have not checked to see where it was coming from.Rear seals do not leak very often but will leak.Where I work now we dont have a steam cleaner or black light & dye to see where the leak is.