Best of three.

It's a very useful Toy, designed for ousting the moss etc. twixt brick setts and things. Some places don't manage the full range, some you have no choice but buy a new Brush each time. Wolf© however make replacement heads. Not being the BBC© I don't need to say "Other scratchy things ARE available" but why dodge the fun.
One of the things Barton Grange had was both new heads and even new brushes - two of which weren't far removed from the cost of ONE head.