Turn it off, REMOVE THE BATTERY (important step, batteries are dangerous and do not like liquids), then disassemble it. Remove the keycaps and rubber membrane and wash them with soapy water, and wipe down the gold contacts with isopropyl alchahol. Wait for it to dry completely before reassembling it.

That's like when I accidentally put my iPod through the washer, and then put it through the dryer to dry it out, because why not.

It worked. The iPod lasted another several years.

Did a quick search and it looks like it uses Kalih Choc V2 mechanical switches. The each key cap should be held on to the switch by a friction fit. You should be able to pull each key cap off then soak them in some soapy water. If you don't have a key cap puller, you can try using some string and a pencil or wooden dowel to make a cheap one.

Although from what you described, coffee may have gotten into some of the switches. That would require replacing the sticky switches or taking them apart, cleaning, and re-lubing them. In either case, pulling the key caps will give you a better idea of where all the fluid ended up.

Some people have recommended alcohol. If that gets into the switch it will dissolve the lubricant.

I would say pull a couple keys you care the least about then take a closer look before you decide how you want to tackle cleaning it.

https://www.kailh.net/products/kailh-choc-v2-low-profile-switch-set

Maybe rubbing alcohol? It's a solvent. Ideally you'd want to pull the battery etc. while doing this and try to tip it so the coffee gets diluted by the alcohol and then carried out as the solution drips off. I've seen Linus clean other computer parts with alcohol baths. I'd try something like 70-90%. I might just be talking out my ass though. But that's what I would try if I was determined to try to fix it without taking it apart. :p Make sure it has time to dry before using it.

LTT did a video of putting various keyboards through a dishwasher. Surprisingly, a lot of them functioned perfectly well.

It’s not something I’d recommend, but I figured I’d throw the [bad] idea out there.

https://youtu.be/pgnF42ZoRSw

You can easily take apart a keyboard and individually clean the components, just take pictures so you know what goes where

I just rescued a keyboard from a ramen spill over the weekend. There are a few things you can do to make it a bit safer and more reliable than "just dump water on it."

Power off immediately (incl battery).

Disassemble as much as you're comfortable -- removing the keycaps is a must, opening the case is optional -- and use DISTILLED water on any part that may have been coffee'd. Don't apply pressure or scrub - pour directly onto the components (gravity is your washing pressure) with a tub underneath, then swish the components around in the tub.

Let dry for a day or so, then come back with isopropyl alcohol (at least 95%), cotton swabs, and compressed air. Put your keycaps back in and test each one -- any that are still sticky get taken back off, then get a good swab full of alcohol down in the switch or membrane. Use the compressed air to help blow it down in there + assist the drying process.

Let dry for another day or two (until completely dry) before attempting to power back on.

what type of keyboard? Are the switches mechanical?

If they are you can pull all the key caps, and switches. Then use a microfiber cloth with 70% isopropyl alcohol to clean the PCB and case.

You can run the caps through your dishwasher inside a basket so they dont go flying just wash without heated water and heated dry.

For the switches it depends, generally you will need to open them up and clean them with isoprobyl and then re-lubricate before installing them back in.

If this is a cheap rubber dome keyboard, toss it and get a better one with hot swap keys that you can repair in the future.

when I was a kid, I added too much salt to my scrambled eggs, I tried to counter its effect by adding sugar. needless to say, it didn't work as I expected.

If you have a backup, remove batteries, wash with as much water as you like, dry for 1 week. I do this with all my keyboards and it works well

You need to unplug it, take the keys off, and wipe everything down with a little bit of isopropyl alcohol. Do NOT dump more water on it. That could short things more and drive coffee grounds and water deeper into the inside of the keyboard than they already are. Keep it unplugged to dry for a day or so.

Funny story, I spilt coke all over my first mechanical keyboard. I tried everything to fix it, water, rice, alcohol. After all that it still felt horrible so I ended up just buying a new one. But I didn't throw it away, I just stuck it in my closet where it remained for years.

Then approximately 8 years later, I take it out, randomly decide to try typing on it.. its perfect. Felt just like it did when it was new, I dunno if the sugar just broke down or degraded over time or what, but it was fixed.

So if nothing else, just put it into storage for a decade and then try it out again lol.

I did this years ago with a $400 keyboard. In short, it was sticky for a day, then every morning for a few days the keys were stuck in the 'up' position. I just encouraged them to get unstuck and it would work fine until the next morning. After a few days it was fine.

Remove the batteries and toss it in the dishwasher. Let it dry for like a week++