Brushes For Unger Pole

I use a unger extension pole with angled adaptor and click on end cone

The Velux windows don't seem to be as good as I would like them - is there a brush I could fit onto the end cone to try n get the stubborn bits of dirt off then I can mop n squeegee thanks

Unger do a 'Wall Brush' which is available with either, Horse Hair or Plastic Bristles.