Cloudy spot on window? ??

Cerium oxide is what the classic guys use to buff out their windshields. It can buff out windshield wiper scratches too. IIRC it takes a while and you need to use the special pad. It can also put a 'warp' in the window too so when you look out there is a distortion. That fogging happens alot to laminated windshields around the edges. Dont know what causes it or takes it out. Is it a fungus like whats in an old musty SLR camera lens?