Had my first crash today, trying to be too smart by flying over a waterfall and under a bridge from distance!  Once it hit the rock it submerged in a foot of ice cold water, but was able to fish it out.
Only damage was a shattered lens cover and after drying it miraculously flew again.  What amazing engineering!

Your drying has likely NOT BEEN LONG ENOUGH, several days in a warm place seems to be the minimum recommendation. Above the hot water tank comes to mind but NOT in contact with the tank. Corrosion is now the biggest danger.
I would suggest pouring IsoPropylAlchohol (from Maplins (I think they have been reborn)) or Farnells etc. through the body BUT WAIT and see what others say about that, especially with no glass protecting the lens, I do not know what it might do to coatings.

I hope you will get it fixed completely

Keep an eye out for corrosion starting.  Water and electronics is never a good mix.

Hello there Selsdon. I am sorry to read and to know about what happened to your DJI Mini 2 and thank you for reaching out. If you feel that your DJI Mini 2 is not preforming well on your future flights. I would recommend to contact our DJI support team at  https://www.dji.com/support for further assistance and for us to be able to check the said drone thoroughly. Thank you and fly safe always.

One home remedy is to leave it in a bag of rice and seal the bag. Leave it like that for a few days. The rice draws out the moisture.

Thanks all, I'll get it repaired using DJI Care Refresh, thankfully got 3 months left on my plan.   It was strange that even when submerged the drone was still on with a solid red light and I was able to turn it off with the double tap.  Now in full on drying mode and will send away for repair.

Selsdon Posted at 12-28 00:05
Thanks all, I'll get it repaired using DJI Care Refresh, thankfully got 3 months left on my plan.   It was strange that even when submerged the drone was still on with a solid red light and I was able to turn it off with the double tap.  Now in full on drying mode and will send away for repair.

Definitely worth the repair,  thats now a ticking time bomb.

Suren Posted at 12-27 21:07
One home remedy is to leave it in a bag of rice and seal the bag. Leave it like that for a few days. The rice draws out the moisture.

NEVER RICE!!!!

Has anyone ever quantified how much atmospheric-water rice will absorb? lb per lb etc.
A lb per lb  comparison against other deliquescents would be good .
Aside from that, loose rice and shattered grains can get every where.