If you want to clean the laptop without the keys connected, as well as the keys themselves, you will need to use a knife to remove them.
Be careful when taking them out so that you do not damage the keys, the connectors, or yourself. Before prying keys off, make sure you understand how to replace them. Some laptop keys are harder to reassemble than others. If you're not sure, try popping off one key and replacing it before you pop them all off.