I like to wash my hands outside after gardening and weeding. I gather up soap pieces, put them inside an empty onion net, and tie it to an outdoor spigot.
I might add, it is a good idea to scrape your fingernails over a bar of soap before doing garden work. That way the soap keeps dirt out from under nails, and soap ready to wash up with.
When I am done, I always have water with soap in it , since I do water my plants with soap water. I wash them outside first then come in the house & use the finger brush on my hands.
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