i use a few handy poles i got in BandQ , i use one or other every single day . my favourite is the Quickie 3 part pole , its very light for starters and is about 10feet long extended. another great BnQ POLE IS the 2foot telescopic ,its make is ANZA
i also have a 6m.pulex pole ,but in hindsight i reck the BnQ harris pole would be better for reaching over conservatories.
i see no need for a clamp fitting you can just drape a folded scrim over a squeegee