Cleaning glass sliding windows on upper floors from outside

I assume that there is no usable solution, but first the problem:

In the upper floor of a house, I want to install large, floor-to-ceiling sliding windows (the attic is being remodeled). The idea is that the front (with a superb wide view of the countryside to the south) can be opened as extensively as possible. This concerns an area 4 meters wide and 2.20 meters high. What I wish for is to feel "up there" on the south side like on a covered balcony.

So far I plan to have a fixed glass area of one meter on both outer sides and the middle area of 2 meters can be slid to the right and left. This will not be an "extremely large" opening but should be as wide as possible.

The window surfaces must of course be accessible from the outside for cleaning. The current solution for this is to put a narrow "balcony" in front. Presumably, this will sensibly be a narrow metal-grid floor with a railing.

What I am now considering is whether there are solutions where you do not need a walkable space outside in front of the windows. A railing must naturally be there in any case when the windows are open, but if the surfaces could somehow be cleaned from inside, like normal casement windows, that would save the "walkway" on the house’s outside.

So what is being sought is a sliding-casement technique (which I consciously have never seen anywhere before), where the floor-to-ceiling surfaces can also be folded inward for cleaning. Does anyone know something like this? Or know what it could be called to search for it on the internet? When I enter "fold-sliding door" I always only get folding doors offered (where you can’t reach the outside from the inside either).

Of course, I also welcome completely different ideas that I haven’t thought of so far.

How about just regular doors? I don't see any reason for sliding doors right now. You already have the fall protection in the way on the outside. P.S. I wouldn't have a solution otherwise either.

yes, "completely normal" doors would probably be possible. What I like about sliding doors is that they are "not in the way." Neither when they are only half-opened, nor do they need the entire space in front of them when opening .... but maybe I'll get there too ... :) "Real" doors are also much easier to seal properly from a technical point of view ... that might also be a point I should take into consideration ....

Prof. Femsterputzer have very long handles with which they can also reach glass roofs or 2nd floor windows. In my opinion, they are not too expensive either ;)

The problem is rather the fall protection in front of it. We also have a spot that is one floor higher (fixed glazing). Easy to clean with fiberglass/carbon rod and osmosis system. Otherwise, use a tall ladder or have a professional come right away. However, in this case, I would also rather recommend regular doors.

The house is situated on a slope. Between the garden under the window and the window above there are two and a half floors.
... and in the countryside, hiring a professional for window cleaning somehow seems "strange" to me.

I am still hoping for a lift-slide-tilt door where the pane can be folded out from the sliding door, something like a normal door within a sliding door.
The disadvantage is 1. that I haven't been able to find anything like that on the internet so far and 2. that such a double frame is of course much more massive than a simple one.

But who knows what else I might come across ....