Dawn is what we use and store also. Primarily for cutting grease and oils, but the decon thing is good to know.
Short of a real hand cleaner such as go-go, dawn seems to work the best for dirty greasy hands. I imagine the addition of some sand or dirt would just add effectiveness.

Personally, we stay away from perfumed soaps, keeping with plain old ivory. Because it's just soap, nothing more. You can shave it and use it for dishes or laundry. Perhaps not perfect, certainly better than a rinse. Don't think I would want to shave and use a perfumed soap for dishes. Plus, you might be the only person for miles around that smells real nice. I think that might make you a target.

Now, for trading............

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