my umidigi a7 got soaked.
in a way, I was lucky- I actually charged it, while still wet!

anyway, this is what I did-
remove the battery if you can.
dry everything you can reach with a paper towel- not toilet roll o!
if possible, remove the back cover to dry out more water.
put it in a nylon bag, cover the phone with local (NOT PARBOILED) rice and tie it.
the rice acts as a desiccant, absorbing the water
leave for a day, standing at a 45 degree angle with any side ports facing down.
put under the HOT sun for 3-4 hours (at 45 degrees, as before)-
the water on the inside becomes vapor, which is absorbed by the rice.
take in and leave for another day-
45 degrees angle.
at the end of AT LEAST 48 hours, take out your phone and clean again with a LINT FREE cloth.
use a toothpick to track all the ports and slots.
NEVER USE METAL ON YOUR PHONE, EVEN WITH THE BATTERY REMOVED!!

and you're done.
good luck!

Engineer

Joysticks:
Engineer

at all o.
all credit to YouTube!