Here’s what we do, takes 25 minutes:
1. Unplug the keyboard, of course
2. Google a layout of a keyboard and print it, or draw one yourself.
3. Pop out the keys with a knife.
4. Soak the keys in warm soapy water in a big bowl for a few minutes. Swish around.
5. Rinse them and dump into a sieve. Shake around to get out the most water.
6. Put the keys into a big towel and shake it around. Leave it in there for a good 10 minutes.
7. Wipe down keyboard, with knife and damp shmattah.
8. If you have compressed air, that does 50% of the job.
good luck!
Note: You should probably have someone who knows what they are doing help you if you are going to take apart the keyboard so that you don’t permanently damage it.