I've always wondered what exactly is the deal. Like, what it left after you've soaped something up but theres still something foreign still visually present. Does that count as clean?
For example, say your job is roofing and get lots of black stuff on your hands and wash it off rigorously but its still stained on your hands.
For another example, people who don't really scrub their dishes very hard and can live with visual blemishes and prior food specks on it.
And as a last example, lets say you just soak a dirty spoon in soap, pull it out, and wipe it off. It still has visual old food globs on it. Can you just eat off that as if it were a clean spoon?
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