CaptainSpod

I always put 70% on my windshields only due to the fact I tint the sides and back windows dark, so I have plenty of privacy. Not to mention I still get 18% glare reduction from my 70% which is plenty for me. No reason to go darker for me personally unless you're not trying to be seen for whatever reason, or you legitimately have a medical reason to go darker.

More than likely it's some contamination that is occurring due to dirt or even some carpet fibers, depending on the vehicle. Always be careful when squeeging the bottom portion of the back window, cause if you drag your tool incorrectly and have your tool dragging along the carpet, you could be causing little particles to resurface in the air and back onto the glass. Never hurts to clean twice!

We know someone who has been tinting as a side job for extra cash. He recently installed 35% on a younger guys windshield. Well unfortunately the young man did not see a girl at night time who was walking, he hit her and killed her. I don't care how good your eyes are, or how you adjust them to fit something that isn't needed. When you start going to such dark percentages, you are risking not only your safety, but the safety and LIVES of others. 

Very impressed with how the car is turning out! Shouts out to your professionalism and art in the craft!