OK
Like I said this is not fool proof but it has helped me on some windows and of course I will share it with you all...
Get a Ladder out ( Just kidding )
You will know if you have these windows after the first clean IE windows that leak in or paint from rubber running down the glass..
So this can only be done after first cleans... Its all about reading marks on the glass or seeing that water goes in...
THE METHOD
WINDOWS THAT LEAK INTO THE HOUSE
This seems to happen on the little panes above an other window, by now you should know which ones they are..
So first hold the brush for the little panes and just a quick spray, then turn off the water ( you are going to need to be able to control your water when you need it )
then brush the window with no water on, then turn your brush facing a wall and turn your water back on but this time get the flow down to as little as possible then rinse the window.. The rest of the windows you do as Norm
Windows that the water holds in the frames and then runs out ?
Again this seems to happen on little windows above the main window so repeat above advice, but if you have 2 little windows above the main window when you clean then on the first little window try not to take your brush across to the other little window with the water on . It can run in between and bring more dirt down.
Windows that stain the glass with some kind of paint, substance run from the rubber seals.
Take your brush 3/4 of the way up the window and turn your water on, brush down the window wetting most of the glass, then turn you water off then brush from the top of the window all over as if you had your water on. then again you want as little flow as possible, rinse from the top down as you get further away from the top of the frame you can turn your flow up
WINDOWS With OXIDIZED rubber seals
This is the one that Iam not too sure about ? I have this customer who has this window on her house, its the only window and I really do not want to get the ladders off for one window..
The Window has 3 panes of glass, one main one. a little window above another.
What I do is exactly the same with this as I do with the paint running out of the glass. First the main window, wet the glass only 3/4 of the way up the window, turn off the water then brush the whole of the glass and then get a little flow and rinse as you go down, you can turn the flow up. The little panes above the other, give it just a quick brush, your brush should still be wet, then rinse again with as little flow as possible. Then the last window do the same as the main window!
This window has always given me problems, I went to check it before I posted this! The main window SPOT FREE and the little window above the last window SPOT FREE but the one underneath that one spots. What I think is, as I have rinsed it, it has dripped onto the rubber. So what I am going to do next time is do the main window and the other one above last and then go back.....
As you can see my method is to brush the window with as little water as possible. It's still doing the same, the little water on the window is moved around to pick up dirt then a rinse..........
I will keep you all informed as to my progress and hope this helps on your windows as well.
Thanks