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A set of keyboard keys darkened by heavy typing and oils responded well to mild baking soda paste followed by short peroxide treatment — then rinsed and dried. The keys looked bright, almost new.
Home Appliance Casing
An air fryer shell exposed to heat and oil was stubborn. Repeated lemon + sunlight sessions made it visibly better, but full restoration needed a sanding + repaint for uniform brightness.
FAQs
Q: Can I use bleach instead of hydrogen peroxide?
No. Household bleach (sodium hypochlorite) can damage plastics and weaken them over time.
Q: How long should I leave peroxide on plastic?
Typically 2–8 hours under UV light. Avoid overnight sessions without checking, as over-bleaching can weaken plastic.
Q: Why does yellowing sometimes come back?
If the underlying cause (UV, heat) persists, yellowing may recur. Prevention is key.
Q: Is this safe for kids’ toys?
Use gentler methods (lemon juice/sunlight, baking soda) on toys, and avoid concentrated hydrogen peroxide on items kids will mouth.
Q: Will polishing alone whiten plastic?
Polishes improve shine and remove light stains but don’t reverse internal yellowing.
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