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Aka, how well do I need to clean my current chain before emersion?
The cleaner it is, the better. If it's new, you know the only thing you have to remove is factory grease. On a used chain, you're trying to get out every lube you've ever added plus a load of powdered metal/metal oxides from the rest of the drive train and a choice selection of whatever the local roads are made from made sticky with nan0-particles of diesel soot and rubber.
If you wax a chain do you need to do it from new? Aka, how well do I need to clean my current chain before emersion?