Keyboard cleaning

The good thing about freelancing is that one gets a good amount of spare time to relax the eyes and go for a digital detox. Add to that a global pandemic, and you get to learn some new things.
I decided to open my keyboard which had been gathering dirt for many years. Here's the "before" picture.

 

Opening it up showed how much dirt had accumulated over the years. But I also noticed that the reason that the keys didn't have a smooth movement when pressed down was not the dirt. It was because they had to slide down the plastic, and there was no lubrication.

 

This is the membrane the keys push down. It's a "dome switch" which completes the circuit when the finger presses it down.

The circuitry under the domes. I was surprised at how minimalist it is.

 

A word of caution. When removing the key caps, don't use a compass or an object that exerts force at a single point, because it'll cut a groove in the plastic, as shown in the image below. It's better to use an old debit card or a professional key cap remover or even make one yourself using metal wires.

After cleaning and drying, the keyboard looks good as new!!! I wanted to apply some grease too, but some forums and comments warned against using grease or oil without first checking how it'd affect the plastic.

Don't forget to take a photo of the keyboard before opening it up. It'll help when you are putting back the key-caps.
Next time I'd go for either an ergonomic mechanical keyboard or a buckling-spring keyboard.

 

[update: Jan 2021: Since the keys felt difficult to use as the plastic was scraping against plastic, I took off the key-caps again and used a small paintbrush to apply a thin layer of grease at the portions that were scraping. It worked really well after that. Do take care that you shouldn't use grease that affects plastic negatively].