If you are using a mechanical keyboard, then there are high chances that it gets dirty quickly. You will start hating to type on it, because the dirt gets accumulated quickly. There is a simple solution for it. remove the keys and clean it using water and a little quantity of soap, you can use a brush if you have. Soak the keys in the soap water for few minutes and dry the keys before you put it back on the keyboard again.
It’s been months since I used keyboard, because I started using the laptop keyboard, as I want to save the space on my table. But, sometimes I like to use the external keyboard. The dirt get’s accumulated quickly if you don’t use the things. The same thing happened with my mechanical keyboard. So cleaned it today.