Hi,
Any levellers will be good as they will have been tested to destruction. You might find that too many accessories can get a bit fiddly. A small block of wood has done me in the past. As always, test out how you place your ladder every time especially when surfaces are wet and
green on slabs, concrete etc. Remember, if in doubt dont do the window. Most customers will understand. Or use a pole for that window. I always push my ladders back and forth, with experience it will tell you whats going on. I often twist both my boots exactly where the ladders are to be placed. This usually does the trick. If your area of window cleaning has a lot of gradients though, don't make do, try out the levellers that appeal to you the most and keep them in good condition.
Chris.
