Hi all, one of my cleans has this on some of the windows at the rear of the property is has been on the windows since being built? I have scrubbed and scrubbed and even used the old half a lemon trick, but it won't shift? Now I want to be a hero LoL ;-) and do what the last window cleaner failed to do and get rid? View attachment 4235
View attachment 4234
View attachment 4234