My headlights have always had etching. Drivers side only. I've used both 3m and Plastx products with great success. The one problem is that it has to be addressed every six months or so. Its about a 5 minute job with the PC and they sparkle. I also hit them with detail spray once a week when I wash the car and wax them once a month when I wax the car. I have never had an issue with yellowing, just the etching.