Macbook M1 Macsafe's pin in charging port is darker after spilling milk

I once spilt milk into my Mac (M1 16") Macsafe charging port, after that it behaves abnormally. There seems to be like an angle which it cannot charge, I have to adjust the charging cable then it could charge. But after a while, the problem disappeared itself. Now I can charge normally but I noticed out of the 5 yellow/gold pins in the charging port there was 1 with darker color than the rest. My guess is it could be burned due to spilt milk earlier? And do such charging port problems affect the battery as my mac drains battery really fast (5 hour of normal/light/heavy use)?

Thanks