I have seen this issue with water between the layers of the LCD many times. If the water was fresh and clear, the cloudy, semi-transparent effect may dissipate over time. If the water was dirty or had chemicals (swimming pool, saltwater or another type liquid other than water…) then it will never look 100% right no matter how long it sits and dries.
Ideally would be to have a technician remove the screen and inspect the extent of the water damage to all internal components. It may or may not have any other issues, but a lot depends on the severity of water infiltration and chemicals in the liquid. I have had times at my shop where I opened the device that had fallen in clean water and I let the phone sit a couple of days disassembled, with a fan blowing on it and when reassembled, those “clouds” and discoloration have totally disappeared.