HE-MAN, it is funny that you would post this because I will be cleaning the exact same style of windows next week with a friend of mine. We ended up charging some where around .50-.75 cents per piece of glass because there were over 350 of them. The owner told us that the rain had never been an issue with leaking so we are hoping that we won’t have to clean them twice because of drips or something like that. I also have never seen them before so I hope my friend didn’t under cut us. Good luck my friend!
$1 per piece of glass is what I charge. After you remove the screen or storm window (whichever it has), open the louvers and do the underside of the glass first from the inside. Squeegee with a small squeegee along the length of the glass and dry the edges, then go outside and do the tops of each glass starting from the top. This will minimize the amount of dripping. I include the screen in this pricing, but would charge extra for the frames, depending on how dirty they are.
shame about all that wood . dont really like using too much chemicals and water with wood right underneath ( even though its probably been treated ) looks like ist crying out for a Wfp pre wash here. or the garden hose .Chemicals / pure water can react strangely on certain surfaces… looks like it has no sill… does it really only rain once a year there. i always test surfaces when i have a feeling that that particular customer is fussy or the surface could be a problem ( which ime sure you do anyway Herman ) if it was a problem you could tape up some plastic sheeting underneath / around under the sill.
Regarding the louvres… you could try using the wet / Dry cloth method on those with microfibers ( after they have been scraped ?? )