this is what it says on the gardiners website for those who havnt read it already...
Pure-Water Pole-Fed Basic Operating Instructions
This section will provide a basic guide to using a WFP set-up. Please note that it is only provided as a guide and is not definitive as there are many variations in methods.
Having filled the vehicle tank, you are now ready to start cleaning windows -
1. Pull your hose end out of vehicle. Plug in hose reel and reel out your microbore to the furthest point first and then work back.
2. Ensure your pump is switched on. Plug pole in. Extend pole.
3. Turn on flow valve.
4. Always start by brushing the whole window first with your water flow on, concentrating on top edge of glass first as this is where most dirt collects. This is where you start rinsing so you want to get it really clean. Brush entire window at least twice. If this is a first clean you may need to brush and rinse several times.
5. Once window pane has been brushed, you need to rinse off. Holding your pole head 10-12 inches from the window pane you need to rinse the window pane. Your aim is to achieve a 'water-curtain' effect from the top of the pane down. Always build up a 'head' of water at the top and then follow it down the pane with the water jets. Never try to rinse too wide a section of glass at a time, ie, you may have just brushed down a 10 ft wide window but rinse it off in 2 ft strips down.
If cleaning Georgian windows, only rise two panes width down at a time. Check your window after rinsing for any bits that need an extra rinse or even another scrub.
Words of caution-
Vents, be very careful on some modern windows with top mounted vents as these can hold a lot of dirt. When rinsing down be careful not to spray any water into these vents, as it will later run back down as 'dirty' water usually about 5 minutes after you walk away from the window!
Old Windows, these will need a thorough scrub the first clean and careful rinsing afterward as they can hold a lot of dirt in the cracked putty.
That's it - it's simple.