Clean snake weed is a herb obtained by cleaning a grimy snake weed. The herb can only be identified after starting the Jungle Potionquest. Clean Snake Weed is also used during the Legends Quest. It is a secondary ingredient in Herblore used with rogue's purse to make relicym's balmpotion. It is also used as secondary ingredient to make Sanfew serum. Adding the herb to a vial of water will produce a snakeweed mixture. Since it is a non-tradeable item, you can't even trade it with your beast of burden familiars. It is also impossible to withdraw it in note form from a bank.
Twenty marshy jungle vines are found south-west of Tai Bwo Wannai in west Karamja. Grimy snake weed can be found by searching one of the vines, though it may take several seconds. Grimy snake weed is also a common drop from Jogres, which is very convenient for players with higher combat levels who are trying to make Relicym's Balm, as many reside in the cave where the other needed herb, Rogue's Purse, is found.