I use
Pure water fed pole
and some people think i´m a plumber
thinking of removing any reference to it to be honest and might just go with
Traditionally professional window cleaner. Equiped with modern tools.
or summit
have noticed my basic leaflets do a lot better though , so might be worth considering not confusing them with science.
I'm sure if they want it they will ask if you have it, otherwise they might not think your a normal window cleaner
I have NEVER had a domestic ask for it, and only once has anyone even been familiar with it and was happy they could have the villa done in the same way one of you guys properly clean their UK gaff.