here's my recommendation for reducing the glare on the inside of your windshield.... Stuart Semple Black 3.0 on construction paper cut to shape like a dash mat

enough glare to hide a house, or a pedestrian about to step off the sidewalk and into your lane

I did this same comparison in 2018, back when you could buy Black 2.0 on Amazon, but they make a better more light absorbent Black 3.0, though it's doubled in price. It's now $58 with shipping. 

https://www.culturehustleusa.com/collections/black/products/black-3-0-the-worlds-blackest-black-acrylic-paint-150ml

https://justacarguy.blogspot.com/2018/10/good-news-i-tested-super-black-super.html for the before and after photos of 2.0