Demounting and Cleaning Devices

I like disassembling small electric appliances to clean them. I demount and clean, for example, electric fans, keyboards and computers, and so on. Being used for a long time, they become dusty and stained in the small parts that aren't easily maintainable. 

The other day, I decided to clean a PC mouse. The color of it was originally white but it had turned yellow a little due to aging degradation of the plastic. I also decided to bleach it out.

At first, I removed some screws to break down the product to building parts. Next, I chose plastic parts that could be bleached. To bleach them, laundry bleach is effective. A website said that in order to bleach plastics, hydrogen peroxide water, bleach activators and ultraviolet rays were required in chemical explanation.
Somehow, I soaked the parts into water, pour a spoon of laundry beach and place them in the sun for a few days.

In the end, it worked extremely well. The plastic colour returned to white and looked new. At last, I reassembled all parts back. The mouse regained its color, and worked as it had before.