We clean a great deal from the ground. One last year in excess of 50 foot. There was just no way a boom could have got into the tight space underneath, we then came up the back of the store on a right sloping road, the picker just looked at it and the tilt alarm went off - so unfortunately all of that had to be done from the ground as well.
You need a lot of strength to do this work and you have to allow for it taking twice as long as it would if you jumped into a picker.
If you are looking at high level cleaning work get an IPAF/PAL license and work off a picker or find a very strong friend to help you.
I have just looked at a whole store that will be cleaned from the ground - because I am too tight to get a picker in!!!!
Rob