I have been practicing with a 5M pole and 14" wagtail , and following this advice Gather the water away from the top frame in the top left corner of the window with a few short downward strokes. Starting from the left, angle the blade 45 degrees and blade to the right along the whole length of the top edge. Complete the first pass along the top edge by pulling the squeegee down the right hand edge. Working right to left make small arches and curve into the next stroke as you pull down. Make the downward strokes slightly diagonal. (The water runs along the rubber blade leaving a dry edge and hence no vertical line.) For the last downward stroke on the left you will need to start at the top left corner again. Tap the squeegee a couple of times on the window to remove excess water. Complete the downward stroke with the squeegee at a slight angle as shown. However , no matter what I do I am left with some short lines towards the top am I being too fussy , and will I have to polish these off with scrim, or is there a better technique? Also is it important to use wagtail rubbers for the wagtails or will normal ones do?, I noticed there is a small width difference and some ridges on the wagtail ones no idea if this is important!