You say your stove settings are 1-8. Does this mean you will do this indoors? If so DO NOT!

Antifreeze is poisonous, as are the fumes.
If you have pets one lick, and it will destroy their nervous system. On the other hand if you have an obnoxious cat..........................

Use the cheap ordinary antifreeze. The biodegradable stuff can do weird things I am told.

I do mine in a crockpot on the medium setting, overnight in the garden shed.

I take the engine apart as much as I want, usualy completely except for bearings.

For real burnt on obstinate stuff you may have to scrub a bit, usualy just the outside.

When I am finished with the stewing part I wash the engine with water, thoroughly.

Oil it all up and reassemble

Ed S