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You can try cleaning keyboard with a toothbrush, but with repairing computers for 15 years I find - a) buy a USB keyboard b) buy and install a new laptop keyboard (easy-ish install) c) install Sharpkeys - a program that changes a key of your choice to act like something else (example # becomes K)
If you have a sticky key that you know of you may have a couple that you haven't noticed. The number 2 key sticking usually means something was spilled on it at one time.If nothing is spilled you will only see the keys at the sides act up and usually the longer or larger ones. These act up from not hitting them straight but at an angle.
The next time it does this try thumping the keyboard to jar stuck keys loose. The key may look ok but is stuck just enough to do this. You just need to flick a finger at the keyboard to knock them loose. You may have to do this a few times before it dislodges the offender. On a normal keyboard you flip it over and knock on the back like knocking on a door to do this. On a laptop you can't hit it as hard.
If the keyboard keeps doing this your option is to replace it. Depending on the make and model a new laptop keyboard is about $45-$75 and is installed in a few minutes.
HURRY IMMIDIATLY DISCONNECT THE DEVICE FROM THE COMPUTER. you may short your motherboard if you dont act quickly.
What i would do is turn it upside down. Shake the liquid out while upside down. you must let it dry for quite some time i recommend 72 hours. it sounds harsh but if you wanna use it again that the best way to go.
Another thing to do is apply heat from FAR away to evaporate the heat.
let set for 24+ hours.
after that most of the time the keys might be sticky depending what you spilled in it. take apart keyboard with care and clean iwht alchol.
Should last a long time as long as the keyboard is being treated in a rough manner. I've had my keyboard for 3 years now and it still works fine.
Alot of times, dust or dirt gets in the keys and that can cause problems. You may want to use a can of air and blow underneath the keys to get extra dust or dirt away from it. That can cause keys act funky. Also any kind of liquid can cause problems as well.
Check to see if your shift, control, alt, or other modifier keys are stuck on your keyboard. These can cause your keyboard to act erratically. Also, if this is a wireless keyboard, you may need to change the batteries, as this can also cause a keyboard to act erratically.