Most would say to practice on your own house windows and those of your relatives first. This is the best way of putting the theory you have learnt into practice. You then let the windows dry and see what the problems are. Just guiding a brush at height is a skill in itself. Vertical strokes are easier to manage than horizontal ones are.
As you have your first clean to do tomorrow then you just have to put on a subtle air of confidence that you know what you are doing as this is old hat to you.
Firstly, lets hope you have UPVC windows rather than a house with painted wooden frames that are in terrible condition. Then you need to give the window frames, top, bottom and sides a good scrub along with the glass. Run the brush along the top of the glass. along the bottom and then the sides. Then clean the glass inside the 'box' you have created. Rinse very well. More onto the next window and repeat. Then start at the bottom windows and do them as well. Obviously include the cills which you do last with every window. Between windows it might be worth your while running your fingers across the brush head with the water running to remove any muck and spider webs.
You might have to wait a while and go back and reclean the glass only starting from the first window you cleaned. My advise is to tell the customer you will be back to check if the windows are all ok once they have dried. Once you are happy with the result, then ask for payment.
We have been doing wfp 12 years and we still use this same procedure if we are doing a new clean.
Here's Alex's video that will also help you.
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