Vikan sill brush !
Biggerf brush to surface area and great for cleaning cleaning fancy bits at the top as you can rest it and clean at the same time.
Alot of people reckon a SL is the way to go, problem with that is that your holding the pole up to clean the fancy bits. With a sill brush you dont need to.... spray, scrub and rinse with the hosepipe
In the words of the meerkats ......
SIMPLES !!