Why is my Motorola Moto X4 maximum charge 4%

I have been having this problem for nearly 3 years now. LSS I accidentally got milk inside the charger and my phone has been finicky about charging ever since. I've had short periods of time where my phone would randomly start working like normal for about a week until suddenly it would go back to the "life support" state where it needed to be charged 24/7 if I ever wanted to use it. Weirdly enough it started working like normal around the end of May, however, just a day ago I used a new charger in a new outlet and suddenly my phone was acting crazy. it went from 20% to 60% in a matter of seconds then down to 30% and went down slowly as if I never plugged it in. Now I'm trying to use y normal charger with the usual socket and the maximum charge is 4%. Any solutions?