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Im going to assume you didn't spill anything on the keyboard here...The best solution for you is to take the keyboard out and reseat the ribbon cable that holds it in place. Sometimes those cables get just a little bit loose, but a little can cause a lot of trouble as you can see. Let's see how much trouble...open "notepad" or some other writing program you have....type every single letter and number and see which ones you are missing. Let me know if there are any others that don't work....then we'll go through the process of taking the keyboard out and reseating it.
Not sure I can tell you anything you don't already know or want to hear but the first thing I would do is flip the laptop over so any moisture from the spill will seep out of the keyboard etc... The problem being that if the laptop was powered up when the spill occurred, there is no way of knowing where that spill ended up or more importantly...what damage it may have caused... By flipping it upside down.. any residual fluid may drain out and you may get lucky and everything come back to life but the downside is that the fluid could conceivably caused a short someplace on the circuitry beneath the keyboard ... ( hopefully that is not the case) but there is always that possibility... If the only thing that is not working is the right and left command buttons... then you may be able to bypass them with an external mouse... With the power shut off to the laptop... try cleaning that area with alcohol and let air dry for a while... you may have residue beneath the two keys that are causing them to stick or always be on /off so pressing them has no effect... Not sure any of this will help you but it may give you some ideas of what to try.. Good Luck...
Could be some residue from a spill on the keyboard, or could be some old rubber thats not flexible enough. If you carefully flick a key off, you can investigate what's going on under there. The keys snap on and off rather easily. If you see anything sticky on there, use an electronics cleaner, or even some rubbing alcohol on a damp cloth or que-tip to clean it up. Recommend turning off computer completely and removing battery. And go easy on the cleaner :-), liquids and electronics do not play nicely together!
If none of that works, might have to start looking for a replacement keyboard for the laptop.
It is likely the only problem is that the soda is causing the keys to stick. There is probably no damage to any other internal components. Usually, laptop keyboards have a metal-based frame/tray that will protect the internal components from minor spills.
If you want to get rid of the cracking sound, you'll need to purchase a replacement keyboard from the laptop manufacturer or another source such as eBay, and then remove the sticky keyboard and replace it with the newly purchased one.
Depending on how hard it is to remove your laptop keyboard (be careful, don't do this if you don't know how, some laptops are easier than others) you might be able to take the whole keyboard off (not just individual keys). If you can do this, you could try holding it underwater for a few moments, pressing keys and getting them to "unstick." I know normal desktop keyboards you can just throw in the dishwasher (on gentle, if you have it) but that will ruin your laptop... If it's a popular laptop you might be able to pickup an extra keyboard on ebay or something, but you'd have to know how to replace the keyboard. I guess you could take it to the nearest laptop repair place and see how cheap you could get them to do it. =\