Plastic parts of older computers become yellow or brown over time, so you end up with a computer that looks yellow or brown instead of white or gray. In this tutorial, we will show you how to restore old plastic parts to their original color by using a homemade peroxide-based solution called Retr0bright.

First of all, we must explain that we are not the inventors of this solution; we are giving full credit to the original group that developed it. Also, on their website, you can see the original recipe and alternative recipes for this solution. We won’t repeat what is already written there; we will show you some results we got from using this solution and some tips.

You will have to disassemble the computer on which you want to use Retr0bright, and remove the plastic parts that you want to restore. You can’t leave the computer assembled, since you will need to wash the plastic parts several times, and obviously, you don’t want water touching the electronics of the computer.

You need to clean the plastic parts very well before starting the process. We recommend that you clean them in a utility sink using a sponge and detergent.

Basically, after creating the solution, you must apply it to the plastic part you wish to brighten up with a paintbrush (don’t forget to wear safety goggles and gloves while handling the solution), and put the plastic part under ultra violet light (a.k.a. “black light”) for a couple of hours. (Some users report that placing the parts under sunlight works just fine.) After this time has elapsed, you should check the result, washing the parts in a utility sink with a sponge and detergent.

If the parts are already the way you want them to be, great. Otherwise, you should apply more Retr0bright and repeat the process for two more hours. From our experience (at least where we are located, which has very dry weather), the solution dries after about two hours, and that is why we recommend the two-hour cycle.

Some parts will clear in just one two-hour cycle. Others will require several cycles. We will give you some real examples on the next pages.

In Figure 1 you can see some of our plastic parts under ultra violet light. We had so many old computers in our collection that we created a box with four UV light bulbs in it and applied a reflective foil around the inside panels of the box.

Retr0brighting our old computer partsFigure 1: Retr0brighting our old computer parts

Before using Retr0bright for the first time, we recommend that you test the procedure with an old plastic part that is yellowed and that does not belong to your computer, so you can better understand the process and fine-tune it, especially because of the caveats (see last page).


Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.