Hi not sure but what I can make from GG4 with the bit about staying cleaner for longer now don’t quote me on this might be a load of old tosh.
When a window is clean with washing detergents it leaves a film where dirt sticks to it? when it rains the film maybe becomes sticky? So dirt moves down the window sticking to it, when you use GG4 there is no film on the window so could this be if it rains the window is rinsed off?
Does anyone remember tomorrows world with the window that cleans it self does this originate from this idea?
What do you lot think
Cheers Alan