Are you experiencing yellowish dull colored Headlamps? Here’s the Solution which is Simple, Easy and “Cheap”. What you just need is,
• 1 Bottle of Brasso (Small Bottle would be enough).
• Cleaning clothes. (For wiping purposes).
Get one of those cleaning Clothes. And pour Brasso into it. Just wipe through the headlamp up to 20-30 mins. Don’t let brasso to dry on headlamp lens cover. When cloth is getting dry add more brasso to the cleaning cloth and wipe again, Hard as you can. After 20-30 mins of wiping, just let it to dry and move to the next lamp. Let both lamps to dry and after 5 mins of drying just wipe all the brasso left on Lens cover using a new cleaning cloth. Experience the difference. I have done this to my Corollas (121) Headlamps and now they look like new lamps. Worth a try guys.