Well my DeWalt 20 volt drill went for a swim this morning in salt water. I soaked it in a bucket of WD-40 and blew it out with the air gun. It’s still going but any bets on how long before it gives up?
If you are confident - it should last if it was cleaned and dried. There is no oil that is in the motor so there is really nothing to contaminate - you could also place it on a cookie sheet in the oven at about 150 (for about 1 hour)to make sure it's dry.
I don't know if it will ever be the same. I do know that there are a lot of very discounted sales of Dewalt 20 volt drills right now. I would get a spare now. Maybe wait till Black Friday, but definitely get a spare before this one gives up the spirit just when you need it.