I am not sure if this qualifies, but I am using a solution of high alkaline water (11.5ph) with a touch of Ecover and a shot of isopropyl alcohol. This is working brilliantly. The key is to use only enough soap (the water itself is very wet and is slick to the touch) to give the squeegee glide, as water - even this basic - is still a tad dry for a squeegee blade to pass without chatter. I should mention that for larger plates of glass this isn’t an issue. My theory is that there is more water on the glass and that provides lubrication. There is a smaller amount of water on the glass with smaller windows, thus reducing the self-lubricating effect. I do use Wagtail PC’s, though, other squeegees may be more forgiving.
This performs several functions for me:
The first being that high alkaline water emulsifies oils and fats on contact. As most dirt is in fact oil and fat with particulate matter glommed onto it, this dissolves the medium that holds dust together. At least, that’s what my high school chemistry (what I remember of it) tells me. You can see this in the bucket. After some cleaning, the water doesn’t get dark, but stays clear with silt at the bottom of it.
The other benefit is detailing. With good squeegee technique, this very wet water transfers onto the scrim nicely, and since this produces immaculate windows with minimal residue the need for touch up is minimized. But when the solution dries, it comes off clean with a slightly damp rag, making touch up a breeze since I am not, in effect, pushing dried soapy grease across a window.
Another is the mop is kept clean. I have scrubbed very dirty windows and my white Ettore Porcupine mop was brown, after soaking in the 11.5 ph water, it is made white again with the silt falling to the bottom of the bucket. I do change water and mops regularly, but this is quite astonishing.
For WFP and windows that need mild prep, I spray the alkaline water direct onto the windows straight with no soap or alcohol, let it dwell for a couple of minutes and then scrub with a white pad. I then proceed to clean as usual with stunning results.
And, the water can be consumed (well, without the Ecover or alcohol!) because it is, well, water - so it is safe and super green. Try that with a chemical rich solution!
As I am still doing a lot of research with this, I don’t have photos yet, but I will start documenting my results as more work comes in.
I am also keenly interested how this works by soaking and wringing out a thick microfiber pad (the fluffy Unger pads) with the high alkaline water for inside cleaning and moving past the squeegee altogether.