I have the exact problem on my wifes inner windshield as its the only one without tint film applied to it -
My solution is to visco clay it, I think there are some bonded contaminants on the inside probably from sitting in a factory somewhere which makes it "sticky" - I call it "grabby" personally but I agree 100%
Visco Clay on the interior glass should not harm in the least and at least you will know its contaminant free, will update after I clay the inner windshield of my wifes car this weekend to see if it cures it.