Swirl marks on the inside of the glass?

I've been pretty inactive around here recently, too busy at school studying to take some time to get back on and read about all the new products/information!

Anyways, I just realized tonight when I was driving that I have swirl marks on the inside of the glass. No big problem for the driver/passenger side windows, I can take care of those no problem.

But what concerns me are the swirls that are on my rear window with the defroster lines. I doubt that there is a way to get rid of them without damaging the lines, but it will drive me crazy seeing swirls whenever a car is behind me at night. I have no idea how they got there and I'm 100% certain they are on the inside of the window, I checked multiple times from different angles inside and out. My questions is whether there is anything I could do to them? Filler? Or is it just something I must live with (that is unless I decide to replace the rear window but as a student I don't have that $$$)

 

Many body shop supply vendors stock 1/4" masking tape. You can utilize this to mask the wire grid on your aft windshield. Despite many wholehearted efforts to polish glass; I have yet to successfully correct any defects. I have noticed a subtle improvement in clarity; however, this benefit is almost negligible. I'm not familiar with a specific product which effectively fills defects on glass surfaces. My advise is to seek the services of a professional who is intimately familiar with glass replacement and repair or simply live with the problem.