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Beal - Rope Cleaning Brush
(Get this price if shipping outside EU)
A great little brush for cleaning, removing grit and other debris that discolours and abrades ropes.
As simple as pulling through your rope a couple of times whilst submerged under water (do consider adding Beal - Rope Cleaning Fluid to make the cleaning process even more effective).
Works with common diameters of climbing ropes around.