Some day you be caught
Today , I picked up an Extra Fine 1907 Indian head cent , another common, Indian Head Cent in Fine , an About Uncirculated 1878 S silver Morgan Dollar , an 1878 7 Tail feather silver Morgan dollar in Very Fine and an Uncirculated 1942 S silver quarter .
With copper coins all you can do is gently wipe them dry with some soft , non abrasive cloth when wet . If they have started to turn colors or bubble it is just too late . Gold is no problem because it will not corrode . Silver coins just leave them as is , they may tone a bit but it should not really corrode much or hurt the value . Cleaning them will hurt the value .Is there any hope for coins that have been in a flood?
Don't clean them, or too late anyway?
Seeing that FrancisMarion, the OP has not participated in this thread, and nobody else besides you, I think the answer is, NO.