@OP
Clean it further/once more or a few more times with IPA.
My mom won't listen to me, and keeps having coffee just where it can spill onto the keyboard, and ended up soaking two keyboards in coffee. When the first one(a Samsung keyboard) was out of service, I cleaned the PCB sheet with wet cloth and let it dry. When it did not work I bought a slim-ass Nav-Tech keyboard. Even this had a similar sequence of events. Then I bought the TVS keyboard. It is definitely one of the best, if not the best, for the action.
I reopened the old keyboards and cleaned them more detailed-ly with IPA, and they are working as they must
. Each of them must have seen at least 5 years of usage.