I realise there will be some who will be already aware of this method, but for those who are not, I thought I’d share a method that seems to work well.
Basically it is a combination of two ideas. Pre-spraying and one passing. I took John Germany’s idea of using a pump spray bottle, as I liked the idea of not having to dip my hands in a bucket during the cold winter months, and it has been working very well.
The wagtail whirlwind that I use is suppose to have two functions, either flip the pad, scrub, then squeegee, or simply do the window in one pass, with the pad below the squeegee.
I found that the one pass didn’t really work well if you were using a bucket as when one passing a dry window it was difficult to get complete soap coverage from the pad alone, and you tended to be left with dirty edges. However, since I ditched the bucket, and switched to pre-spraying the windows, which takes no time at all using a pump sprayer, I found you can very effectively one pass the window using the whirlwind, as there is already a nice even covering of soap all over the window. It’s so quick.
Obviously this would only work well with windows that are cleaned regularly and don’t get too dirty, and particularly well in the winter when there aren’t so many insect droppings around.
To illustrate what I mean, watch these two videos, which individually show the two techniques separately, pre-spraying, and one-passing.
Pre-Spraying: Pre washing with a sprayer - YouTube (this is not my video, I only posted the link to show what I meant by pre-spraying, everything after the pre-spray is not what I am talking about)
One passing: Wagtail Whilwind Window Cleaning Tutorial - YouTube