Hey Thor - I've read many times that making ABSOLUTELY CERTAIN that the entire unit is 100% dry is the key to success after a mavic bath. If you try to power it up with even the slightest bit of moisture it could fry a board.
If I were you, I would remove the battery and trash it. It probably won't work again anyway and could possibly do damage to the mavic. I'd call that a $90 loss. Second, I'd put the mavic in rice for 3 days straight, and resist the temptation to take it out any earlier. Then make sure that ALL of the little rice particles are clear - especially in the motors, before putting a new battery in and testing it in a wide open place (in case it goes crazy). That's what I would do. I've read some surprising success stories from people following these steps, including one where the mavic was underwater for about 1/2 hour.
Total repair:
New Props: $24
New Battery: $89
2 Bags of Rice: $3.69
Good luck to you and let us know how it turns out.
PS - Legend has it if you boil and eat the rice after using it, it makes you a much better pilot.