Hi Insxne.:
Along with the suggestions of Logixal and bill, I would (also) first recommend (1) a careful teardown and then (2) a thorough cleaning of the mainboard and keyboard.
For the cleaning part, I recommend using ''isopropyl alcohol'' (90%) in combination with a brush. Make sure to also treat areas where the liquid might have creeped into. The isopropyl alcohol will pull out any water remains and will take care of any stickiness. And, after having dried the motherboard (at least for 24 hours), there will be no remains of any water.
Another suggestion: Look for any fuse on the mainboard. Maybe one blew. You might work with the schematic diagram/PCB layout for this mainboard in order to identify where the fuses are located on your mainboard. Or, in order to identify fuses on ''your'' mainboard, you can also try to identify fuses on a different mainboard first. For example, [link|https://thinkwiki.de/Datei:Mainboard-t420_topviexykuz.jpg|this is a mainboard of a Lenovo T420]. All fuses soldered onto the mainboard are labeled with the letter “F”. The label “F01”, for example (for fuse #1), is also printed on the mainboard. So, a visual check of your mainboard might be a first good step to see if one of the fuses blew due to an electrical short caused by the liquid.
I hope this helps.
Steffen