Keyboards get very dirty. Everything seems to drop into them, such as hair, skin flakes, and food. When I learnt how to clean keyboards, cigarette ash was common enough as well.
Ewwww!
There are two ways to clean a keyboard, disassemble and wash by hand; or dishwasher. This post will cover using a dishwasher.
Why? Well doing this: 
takes me about 4 hours.
Dishwashing.
Disclaimer:
I did this on a keyboard I can afford to replace if it didn’t work.
You might want to think about that.
1. Preparation
Tie up the keyboard lead 