Agree wholeheartedly with Kimber's comment about nobody going in the water until ok'd by the skipper.
You will need to judge the current situation and other potential hazards. Might be good to have the dingy ready and warmed up in case it's needed quickly. A dingy on the davits is not all that useful for a "need it right now" MOB solution.

Liquid joy works well for showing on the back deck.
It saves a ton of fresh water.
We jump in the salt water, soap up, jump back in to get the soap off, and then use a little fresh water from the tank, about a quart, to wash the salt off.