How to fix my iPhone 12's foggy camera?

i put my phone in a water proof case and then i didn’t seal it right so when i went swimming in a lake with it on it got water inside but then i quickly gave the phone to my auntie and then left it but the camera went foggy and my truedepth camera can’t be used but i’m in a hot country and not at home but i’m flying out to another country in 2 days so i would really like to get rid of the foggy camera as soon as possible so could someone help me please

[Re-Titled by Moderator]