I am a WFP man now But I recently tried something after picking up an idea on this forum.
The idea is to use pure water from the WFP in your bucket and a little drop of Ettore Squeegie Off when cleaning traditionally. The results are fantastic.
The blade drags a bit on the glass so I use 10" blade and Pulex soft rubber.
So good are the results that I now have reversed my old practice of total WFP upstairs and down and now do WFP upstairs and trad downstairs a lot more often.
Buy the best , its a lot cheaper in the long run. Don't get tempted to use washing up liquid. The proper stuff is a lot better and you only use a couple of drops all day.