I figured by that point they were completely hardened! I took the hose and rinsed them off leaving only the sand that was embedded in the plaster.
The hands seemed to work a little better then the feet to me as long as you got the fingers deep enough that they didn't break while digging them out. I was surprised more sand didn't stay. I bet if we had went to the swimming area with the nicer (less clay like) sand, more would have stuck. It is still nice to have some imprints of little hands and feet. This would also be a fun thing to do as a vacation memory!
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