Not sure what type of Laptop you have, but many (most?) laptops require almost a complete dis-assembly before the Keyboard can be removed. The Asus A8JS for example (the laptop I have) is not built in the way you describe.
We have 7 different makes and models and I used to support the laptops for over 100 users in my old job. I'm gonna have to disagree with most. Like I said, most have the panel at the top, but there are some that you have to remove 6 or 7 screws from the bottom (sony's for example and some of the Dells). Either way, I've never found it hard to pull a keyboard and certainly never had to disassemble the whole thing not even for replacing hinges. The Dell's I've worked on that didn't have the top plate only needed the screws removed from the bottom and the keyboard pryed right up w/out removing anything else.
The Asus A8JS is a great example, it's very easy to remove the keyboard. Here's a good set of instructions that someone put together that shows it's only ONE screw removed from the back and the keyboard pops right out without taking anything else apart. I don't know why you think it needs to be completely disassembled??
LINK
Either way, my main point was the ability to use distilled water.
