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Beal - Rope Cleaning Fluid 1L
(Get this price if shipping outside EU)
Non-aggressive detergent developed to clean ropes easily and harmlessly.
Can be used in the machine or done by hand. Consider using the Beal Rope Brush along side the rope wash.
Also be sure to Chain Senet your ropes before you tuck them into the pillow case as recommended, otherwise you will emerge with the most horrendous tangle of rope you will ever see!