Hopeless on Georgian windows and splay to much on most glass there spay and design is best suited to commercial glass imo,good splay is over rated on domestic Windows I don't think its needed an average splaying brush works much better,the new Gardiner ultimate brushes are the closest thing you'll get to the perfect brush in cleaning power weight and splay combined. A brush with hogs hair through the middle is a sales pitch,an ultimate flocked in weight and cleaning power beats it hands down. I've used that type of Tucker and it's almost un usable on leads the outer white nylon bristles make the brush jump like billy o.