Best Way To Clean Morgans That Have Been In A Flood

We obviously don't know how badly affected they are. All we CAN assume is that they ARE affected.
Have a look at any site that tells about the recovery and cleaning of shipwreck coins.
Also search sites that cover the cleaning of recovered ancient silver coins. I guess that acetone is never. used on these!

I would guess that if they had any radial mint lustre, you can forget about it.

Coin by coin START by giving them a distilled water bath.
Pat dry with a lint-free cotton towel.
NO RUBBING.

If there's still debris on a coin upgrade your bath fluid to acetone.
FOLLOW ALL WARNINGS ON THE CONTAINER WHEN USING ACETONE.
You can dislodge a piece of debris by VERY gently poking at it with a cotton swab (Q-Tip).
Thoroughly rinse with distilled water.
Pat dry with a lint-free cotton towel.
NO RUBBING.

Distilled water and acetone will NOT damage a coin's surface.

Note that shipwrecked coins have been sitting in SALT water for a very long time and this flood was more than likely FRESH water, which probably requires different treatments.

Good advice Kanga. Just be as gentle as you possibly can estedman.

Rick

Make no decisions until you see what you have.

In a freshwater flood, expect the end coins to be affected, and the rims of those in between (assuming they were rolled to begin with), but trust those in the middle. They weren't submerged long enough for the water itself to have an effect, and the water is for that period its' own insulation against the corrosive effects of oxygenation.

Nothing which could happen to these coins in fresh water cannot be undone by more fresh water. Don't scrub, don't use detergent, don't waste effort. Soak. Air-dry. Rinse the result in pure acetone, which evaporates completely on its' own with no residue. If stuff is caked, drop the coin into a jigger glass mostly full of water (enough to cover the coin, no more) and do repeated freeze/thaw cycles on it. You'll be surprised what kind of caked-on crud that will remove.

The flood didn't do as much damage as you might think, or as much as they think. This is an opportunity.

From the reading I've been doing, acetone seems to work great with silver. Let them soak up for a couple of minutes and they will dry on their own. No need for distilled water- apparently it can leave some stray marks on the coin while acetone dries up completely; rather fast if I may add. Make sure to use pure acetone (no nail polish remover) and use glassware as acetone will dissolve plastics.