Macbbok doesnt charge and is now dead.

Hello, so about a few months ago I spilled some water on my Mac, took all precautions to prevent water damage but I dont think they were enough. I noticed that my Mac wouldn't charge unless the screen was up and the battery life was terrible. eventually it died and now it wont turn on or charge. Apple bar genius said the battery is fine but he noticed some residue, from the water spill. do u guys think if I clean it I can get it charging again? any tips on how ?