Always wear gloves and eye protection when handling hydrogen peroxide.

Avoid getting peroxide on circuit boards, wiring, or metal components—it should only touch the plastic.

Test a small area first, as older plastics may be brittle.

Tips and Tricks

Disassemble if possible: If you’re whitening parts of a device, it’s best to remove the plastic casing first.

Even application: Brush peroxide on evenly to avoid streaks.

Patience is key: It may take a few cycles for heavily yellowed plastics to fully whiten.

FAQ

Why does plastic turn yellow?
Because of oxidation and UV damage, plus brominated flame retardants used in many older plastics.

Will the yellowing come back?
Yes, over time it can reappear. Keeping devices away from direct sunlight and heat will slow this process.

Can I use bleach instead?
Chlorine bleach is not recommended—it can make plastic brittle, damage finishes, and even worsen discoloration.