Controller buttons not working, possible milk from a bottle help

I laid my sons steamdeck on the bed next to where I was feeding his newborn baby. When I set it down it was working fine. Hours later when I went to play it agai none of the controller buttons would work. Screen works, power button works, volume buttons work. I thought maybe it was because it was almost dead so i plugged it in. Later tried it again and still controller buttons would not work. My So. then looked up controller connection and no controller was found. He did a restart and then did a manufacturer reset and still controller buttons would not work. While he was looking at it he said there appeared to have been a little moisture around the abox buttons, very little and smelled like baby formula so possibly some milk dripped on it and I did not realize it.

I went ahead and bought him a new steamdeck but I was having fun playing it so after spending $430.00 on a new one for him I would like to see if I can repair this one for myself. At no point was milk dumped dumped on it or but possibly some drips from bottle as I was tending the newborn.

No need to tell me woulda, coulda, shoulda comments. I know it should have been turned off immediatly then did some research. If you can help this Nana out it would be appreciated.