A fly line gets dirty like anything else and should be gently cleaned after being used for any length of time. Simply take a bowl of warm water with some mild soap in Wet a soft cloth in the soapy solution and wipe the fly line down. This action is particularly recommended after saltwater fly fishing or when fishing from the edge of a lake or a river. The ground the line is lying on will have plenty of dirt and mud that will be picked up by the wet fly line. Fishing out of a drift boat also creates many problems as the fly line will pick up dirt from the bottom of the boat, as well as invariably being stood on.Believe it or not a fly line can get dirty from water as well. Dirt, algae and dust that are dissolved in water will adhere to the outer skin of a fly line. This is why we make most of our fly lines hydrophobic – they repel water. After wiping the line dean, apply a light coating of a fly line dressing, this will help to re-lubricate the line and gives the fly line a Slick and clean finish.RIO’s AgentX Fly Line Dressing has been specially formulated for this and is highly recommended for all modern fly lines. Follow the directions on the back of the bottle for best application.