With the handy cleaning strategy, which I will go through in a minute, you can make this most treacherous of tasks, fun and simple.
Please note. This can be pretty dangerous if you get it wrong, so pay attention ;-).
First of all you'll have to purchase a plank of wood (or preferably an aluminium scaffolding plank) with a width of around 12 inches, thickness of 2inches (enough to support 1.5 x your body weight) and a length of 10-12ft. When purchasing the plank ensure that it is not damaged in any way; any defects may reduce the sturdiness of it. When you get the wood home, sand away the corners and any rough edges and it'll be ready for use Obviously if you're lucky enough to get hold of an aluminium plank then no sanding down will be needed.
Oh, before I forget. Make sure you don't sand it too well. Too smooth a surface will become dangerous and slippery.
To set this up, see the diagram below.

N.B. For safety purposes keep the length between the two ladders as short as is needed to safely complete the job.
If you find that you are still stretching to reach the higher places, then you need to bring in specialist cleaning equipment. Don't put yourself or others in unnecessary danger.

Place the plank between the rung of the step ladder and a sturdy box. Ensuring, again, that it is parallel to floor and wall.
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