Pretty spots. 56-57 degree water they could still be doing anything and would be scattered all over the place. Sounds like y’all were on the right track if you got 6-7 of them, all I would have tried differently would be cover water quickly.
Wire brush, maybe some powder laundry soap and hot water. For stuff that’s really bad rusted like a seized up pair of pliers, they make a product called naval jelly
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