I used a chemical glass restorer today that claims it can bring glass back from level 2 damage, how ever they rank that. My windshield was so messed up nothing would get the spots and haze off the glass, now aside from the physical chips (which are all over) the glass looks new. I never knew a chemical could restore glass like that. I almost want to follow it up with the sealer just to see how that does for rain and keeping it clean.