The part about blasting is that the media raises tiny, almost microscopic cavities for no better word. These little cavities capture and hold the blasting media. This captured media is released once the engine gets hot and the oil will then circulate those nice sharp little chisels, beginning with the oil pump, then directly from there to those nice pretty cam and crank bearings. Once they get done there, then it's on to cam lobes, cylinder walls, rocker pivots......you get the picture now about media blasting oil covered parts

Might even try oven cleaner followed by a hot water and soap wash (I like Tide) along with the 3M pads Pat recommended - just make sure you wear goggles and rubber gloves.