You know the hold. It's the lip of the top-out, the last sloper before the mantle, and it has three weeks of chalk and every falling climber's sweat on it. You can see it. You can't reach it. So you pull on anyway, and it spits you off. An extendable climbing brush exists for exactly that hold.
Why the holds you can't reach are the dirtiest
Everyone brushes the start holds because they're at chest height and you're standing there anyway. Almost nobody brushes the top-out, because it's three metres up and you'd need a ladder or a tall friend. So the hold where you're most pumped, most committed and most in need of friction is the one with the worst friction on the problem. Outdoors on highballs it's worse, because the top is also where a slip costs the most.
The three ways to brush at height
A telescopic stick brush is the simplest: a brush head on a collapsing handle that extends to a metre or two. Cheap, light, lives in the pad. The bristles are usually small and the leverage at full extension makes it hard to brush with any pressure, so it's good for a quick clear of loose chalk and poor for a compacted sloper.
A brush head on a pole is the routesetter's version. A proper boar or nylon head threaded onto a painter's pole or a carbon pole gives you reach and some leverage. Better cleaning, more to carry.
ChalkBlaster on the extension pole is the third. The SWEEP extension pole is a carbon-fibre telescopic pole with the ChalkBlaster mounted at the top and a pivot head that locks at four angles, so the bristles sit flat on a sloper or a lip whatever angle you're holding the pole at. The jet fan does the work the leverage can't: it blows the loosened chalk off and dries the hold while you stand on the ground. The angle mechanism took Paul 15 versions to get right, and he wrote about why in this post.
Reach, little pressure at full length
Moves chalk, can't dry the hold
Fine for loose chalk on top-outs
Cheap and light
Carbon telescopic pole
Pivot head locks at 4 angles
Jet fan clears and dries from the ground
Boar or nylon heads
How to brush a hold at height without making it worse
Angle first. Set the head so the bristles will land flat on the hold, not on their edge. Short strokes, the same as at chest height, and stop when the shine is gone. With a manual stick brush, let the chalk fall before you pull on, or you'll climb into the cloud. With ChalkBlaster, keep the speed low indoors and angle the airflow up and away from people, and the chalk leaves the hold instead of landing on your shoes. Outdoors on highballs, boar hair only and a light touch on soft rock, and take your tick marks off the lip when you're done.
A word on safety
Don't brush above someone who's climbing, and don't stand in a fall zone with a pole in your hands while someone else is on the wall. In a gym, that means cleaning the top-outs between climbers or during quiet hours. Outdoors it means a quick look up before you start, and never on a boulder someone's on.
What this means on the wall
With an extendable climbing brush the top-out stops being the dirtiest hold on the problem. You get the same friction at the lip that you had on the start holds, which is where friction decides whether you top or drop. For a casual session a stick brush is enough. If you're projecting a highball, setting in a gym or fighting humid top-outs, ChalkBlaster on the extension pole does it from the ground with a dry hold at the end.
Kent: "The first time we cleaned a whole gym's top-outs from the floor it took ten minutes. The setters had been doing it off a ladder, so mostly not doing it."
Quick answers
How long should an extendable climbing brush be?
Enough to reach the top-outs at your gym or on your highballs from the ground, usually one to two metres extended. A telescopic pole collapses to fit in a pad or bag.
Can I put a normal brush head on a painter's pole?
Yes, if the head has a threaded socket. It's the routesetter's classic. You get reach and some pressure, but no airflow.
Does ChalkBlaster work on the extension pole with the brush head on?
Yes. The ChalkBlaster mounts at the top with a boar or nylon head, the pivot sets the angle, and the jet fan runs as normal, so you brush, blow and dry from the ground.
Is a stick brush allowed outdoors?
Yes, with the same rules as any brush: boar hair on soft rock, light pressure, and remove tick marks when you leave.
Carbon extension pole, four-angle pivot head, ChalkBlaster on top.
See the extension poleSWEEP Climbing builds tools for climbers who take friction seriously.
