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Years ago the trick to cleaning an engine was to add a quart of automatic transmission fluid to the oil. The superior detergent additive in the transmission oil was the key.
But techs impressed upon me the best way to clean an engine is change the oil before it gets loaded with combustion byproducts (water and other stuff which combine to form acids). Oil is a detergent. In a pinch I've seen mechanics put a bit of fresh oil on their hands and use it as hand soap. Worked pretty good but of course it was not water soluble so the oil had to removed with a clean shop rag.
Treating an engine to regular and not too extended oil/filter services doesn't require some super duper oil just the factory oil will suffice.
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