The understanding I get as for the cleaning process, when an engine block or heads, or any component comes back from the machine shop, there will be different types of contaminants adhering to the surfaces and hiding in all the inaccessible places.
There are basically 3 types of contaminants: petroleum base, water base, and solvent base. Each one is removed by it's own base cleaner.
The petroleum base contaminants, think naturally occurring residue in an engine, oil, grease, etc. Can be cleaned with naphtha, diesel, gasoline.
Water base contaminants, grit and the glue that binds the honing stones together, left stuck to and embedded in the cylinder walls, also some detergents used in the cleaning process. This is what the soapy water goes after, pressure washing also gets down in the nooks and cranneys where the grit likes to hide.
And solvent based, gets what is left, like synthetic cutting fluids, anything else that may be left. This is in the brake cleaner, carb cleaner, lacquer thinner family.
As for ring assembly lube, I always just use motor oil. Give the rings and wrist pin a few shots before installing the ring compressor. Wipe some oil on the cylinder walls to prevent rust.
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