If you're talking cream rinse used after shampooing, yes, you
rinse it out. If you're talking some other type of rinse -- maybe a
hair treatment or form of coloring, read the directions on the
product.
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In an ice cream store, the dip well is where they put the spades
and scoops to rinse the ice cream off of them. Usually has running
water to it.
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Taste, Analyze, Spit, Rinse, Record your findings/opinions.
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Some brand names are: Acticin, Elimite, Nix Cream Rinse.