In reply to Jon Read:
> Any of the narrow stiff brushes available are good for cleaning up choked cracks, but get yourself a Kent & Stowe Carbon Steel Hand Weeding Knife for proper crack preparation.
Those narrow stiff brushes are great. Curved end saves knuckles and good for scubbing both sides of a finger crack at once. I often carry one with my nut key on routes , they have a krab hole on the handle.
A patio knife is like a giant nut key and half the price but a bit too big to carry leading.