Just to clarify
My suggestion was to open a window and put an arm out, not to lean out of a window!. I have built a very succesful business by not compromising on health and safety and offering a better service than was previously offered.
If you really want to avoid utilising ladders or any other unsafe working practise you can get a small pop up that is a one man operation and or a scissor lift. I don't know how you would get around the steps with the scissor lift but there may be a route around the building, from the other side.
If the client wants the tops doing I would look at making it happen, rather than saying it can't be done.
Suggest the U bend lance to the client - I think you may be surprised how much of the build up will be cleaned. Let them know it is not guaranteed though because you cannot see.
I would never use a pressure washer and ladder combination - under any circumstances! I have very big hands and on the ground often pressure wash one handed and if we are roof cleaning. I also have the upper body strength to cope with the strain on the arm.
I would like to see the defence as an employer, if (god forbid) an employee fell off a ladder, whilst using a pressure washer. The idea that it is a safe working practise is laughable and maybe is ok with smaller works and a mentality of I've got away with it in the past but I thought the general idea of the WAHD was to find alternative working practises where available.
In this instance there are options and I am sure if the ladder users looked at everytime they have used ladders it was purely down to speed and not utilising all available options, possibly because of costing issues.
Pressure washing, ladders and yourself and employees - not really eh!!!. I came off ladders eight years ago, when I had my window cleaning business, that was deemed unsafe, pressure washing is safer?
I would say that the BT engineers have harnesses and use them - certainly the ones I have seen do.
Give me a scenario where I have to get on a ladder to pressure wash and I will find a way round it but if you insist you can clean it yourself!!
Good luck Matt