Sorry, maybe being to cute with my post, in answer to the question, boars hair brush is unbeatable for cleaning power and we use nothing else for SFG cleans, conny roofs and cladding.
But they are overkill for everyday work where your wiping off a few weeks worth of dust, for this you need a bristle that glides over the glass not sticks like $h!t to a blanket. Everyday work is super lights DT or Tecbuk red brushes.
Different brushes have differing uses and qualities
Hopefully that makes things a little clearer
Darran