Car Wash Dan Brush with Telescope Stick Handle and Water Chamber. Active 4® has inclined polyester bristles, which have proven to be very effective. Furthermore, the brush is angled, which makes it suitable for both vertical and horizontal surfaces. Active 4® soaks up water in 1 second and keeps it inside the 120 ml water chamber. While washing, the brush releases the water evenly for 20 seconds. Active 4® is perfect for cleaning of cars, box vans, caravans, boats, horse trailers, garden furniture etc.