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Good instructable, but be careful at cutting to much of your fly line especially if it is a weighted forward or shooting head type line. Removing that much means also less weight to load your rod.As for cleaning my fly line I use a vinyl plasticiser. Same stuff as you use on your car's dashboard to clean and protect it. Works very good on floating lines, but not sure about intermediate or sinking lines. Bonds nicely to the line, fills in small scratches and give it a smooth finish that helps casting.