Hello, This Is Stan At Pro Window Kleening, 22 Years , Don't Know Every Thing But Sounds Like Acid Eching!! This Was Not Rinched Off And Dryed
In The Sun. Try Iron Out And Kleen Good. There Is Other Ways But Try This First. What's Your Tds In The Area? You Will Need To Rinse With Di Water To Prevent Stains. I Have Plan B That I Know Will Work!! Call Me At 605-280-8272. No It's Not A Bat To Know Out Windows !! Ha! Stan, Pro Window Kleening