How can i clean corroded section inside Samsung A51

I dropped my phone in water and opened it after a few days to find a small square shaped copper/pink coloured section corroded slightly (marked). It’s located in the top left corner as you’re looking at the back of the phone. Can this be cleaned/fixed? My phone vibrates but the screen remains black and unresponsive. Doesn’t charge or recognised when plugged into a laptop either. Thanks

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