Good point.
I am not an engineer though.
The other guys in the company are and there are other things that the company does which keeps them very busy.
This would be a very major undertaking for any company. Design, developement, testing, tooling for manufacture would be very costly to produce a viable product. The reallity is that the window cleaning market is actually very small when considering products like these. The end product would probably be far too pricey for any real uptake by the window cleaning fraternity.
You have got me thinking now though

There is always more than one way to skin a cat.
Andrew