While my runner is sitting in direct sunlight the sunlight creates a "glitter effect" on the windshield, it's hard to describe. This "glitter effect" is not seen when not in direct sunlight. Has anyone else noticed anything like that?
Maybe it's a vampire.
Have you been in a situation with a lot of small rocks, grit and/or sand?
Here in CO, we get that on windshields all the time. It's micro-chips on the outside of the windshield caused by the sand and gravel they use on the roads in winter. They are small enough you can't even feel them but when the sun is shining on them there is a sparkle or glitter effect.
I have that too. It looks like the windshield has been sand blasted.