The windows were tinted by Lexus dealer at the time of purchase. After noticing and reporting it to the dealership, the tint was removed by the Lexus dealer, it helped a little bit, but the picture that I have posted is after they removed the tint. After many communications with Lexus , they have agreed to replace the rear windshield. They told me if I replace it and the problem still exist, they will not be responsible for it since the glass it not the Lexus original part even though it is certified and is replace by Lexus dealership. That's why I have nor replace it yet.
I am going to investigate the comments that were provided by Paul. and provide you with the updates.
Thanks,
James