All of mine just went dirty after surgery.
I do use baby wipes that I dampen with extra water on their faces and the boy's wee wees but that's all they got. Waterless shampoo sounds like a great idea!
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226