I use just the AIO on mine. I have used Meguiar's PlastX as well. My headlights still look clear so I guess they are doing the trick so far.
On my 1993 BMW I had before the Tacoma, the headlights had become very yellow and hazy. I didn't get the car until it was about 10 years old. I had some Zymol stuff that worked wonders on them. Had to apply it every 3 months or so but it made them almost crystal clear again. Not sure what it was or how much it costs but it was good for after the fact.
I would keep using the AIO.
2005 V6 4x4 Silver Access Cab, K&N/AEM Hybrid Intake, GC + 3oz. ARx, K&N HP-2009
265/70/17 Nitto Terra Grapplers, Black KMC XD Enduro Wheels, TRD Exhaust, URD Short Shifter
I have never used anything on my plastic headlamp lenses, and never had any hazing or yellowing. My Grand Cherokee is 13 years old and the lenses are still near perfect.
Dunno if washing *might* have anything to do with it... I always use car wash soap, which is milder than dish detergent, and won't strip wax like detergent. And I use lots of water so there's never any hard scrubbing.
plan old basic toothpaste. A friend of mine who is a automotive nerd once told me to put plain old toothpaste on the headlight covers wait till it drys and wipe off with a terry cloth or microfiber towel.
Been in body shop for 12 yrs have restored a few........best thing for discolored or discoloring lamps is to pull them out wet sand with 800 gritt and high solid clear coat.......uv protectant. wroks like a charm
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