System button stuck being held down

Title. TL;DR a soda (coke) was spilled on my left controller and now the system button is stuck thinking it's being pressed down when the button itself physically is not. Any ideas what I can do? I've disassembled it carefully and attempted to gently clean it with 91% isopropyl alcohol and let it sit to dry for a day now, but the system button is still the same. Any suggestions?