Default headset static noise

hi everyone, my lg g pro came briefly in contact of water, after quickly drying it, every thing was working normally as of before except during calls when i'm using headset, i hear a background static noise and i still hear the person at the other end but mixed with whistling and cracking, the thing is the static noise disappears when i use it normally without headset or when on speaker, also no noise when i listen to music or surfing the net though headset.
what i did i opened it, cleaned the inside including the motherboard with isopropyl, still the same problem.
please any help of any kind will be appreciated, as you all know the headset use is crucial and it's getting really annoying.