SOLVED - two annoying squeaks in cabin

About a year apart, I had 2 separate & very annoying "plastic-on-plastic" squeaks develop in my 2018 Crewmax, and both turned out to have the same and unexpected root cause.

#1 Couple months after I bought the Tundra in mid-2018, I installed a grab handle on the driver side A-pillar. That required replacing the old A-pillar trim piece, and installing a new handle.
Shortly after, I started getting a "plastic-y" squeak noises from the vicinity of the A-pillar, even on smooth roads. Noise varied according to the temperature.
Of course I thought it must have been the last thing I touched, so I drove around with & without A-pillar trim, pressing & pushing various parts of the dash & trim, applying smear of silicone lube to plastic surfaces, etc.
None of that worked.
Eventually I figured it out after a few weeks, read ahead.

#2 Last month, another annoying "plastic-y" squeak noise started, seemed to be coming from passenger side instrument panel or glove box. I disassembled glove box, had wife press and wiggle different portions of the instrument panel while I drove, nothing had any enduring effect.

Solution:
Both squeaks were caused by the swivel joint on each of the sun visors! You'd think the noise would have been obvious to localize & locate, but it wasn't.

The sun visor swivels have a stiff, inner & outer, plastic bushing. Not visible from the outside.

I removed the visor, applied some silicon paste lube to the bushing, rotated bushing to work-in the lube, and reattached visor.

Perfectly quiet ever since, including the #1 squeak from summer 2018.

Not much lube is needed - I used a toothpick to apply the lube to the bushings. Silicon paste lube is recommended, because it doesnt smell and is non-staining.

 

Great find. Easy fix but took time. Thank you for sharing this week us all!