i wash the window go round the edges with a damp microfibre while the window is still wet then blade it off and eventualy dry any remaining water on edges with a scrim i know this sounds longer but it has its advantages
there is no danger of leaving dodgy corners or edges missed by whopper ,on larger windows such as shop windows it stops water running down before you get to the bottem of the glass so there is less need to scrim a few inches down the glass leaving hair marks . half the time on pvc windows with good rubber edges there is no need to scrim at all and cuts down on amount of scrims used through out the day
I did that for a while, but noticed some hazy streaks on some windows after I had finished them. Have you ever seen that? Still not sure why - minimal soap, immediately bladed the window including the pre-detailed areas. It certainly cut down on the usual detailing, but didn't seem to work right for me. 
It's down to technique.
I rarely detail - I do as above, swab then a quick wipe round, starting at the bottom of one side, up and across the top and down the other side, making sure I cover enough and press hard enough to take all the water off the frame and the first inch or so of glass, then immediately squeegee from the centre of the top, down one side then back to the top and across to the other corner and down the other side. This gives you a clean edge all round before the film of water left after wiping has a chance to dry off. You can then squeegee off the middle of the glass without worrying about accuracy round the edges. Just remember to wring out your mopping cloth every few windows and you should never need to detail.