I sent my picture to the local dealer yesterday and they sent me a very nice, helpful reply. Basically what sboost said his Tech did.
I shared the photo and your expressed concerns with our technicians. It is not uncommon for oil residue to be present in the areas shown. Tightening the clamps on the hoses shown may minimize the active presence. According to our technicians it is nothing to be alarmed about. I do recommend to continue to monitor and cleaning the surface area may provide you with a better gauge of the frequency of accumulating debris. This is fairly common and characteristic of the engine design. I hope this has provided you with some peace of mind.
It doesn't sound like much to worry about...