so, i made a mistake it seems.... i stored my fly line on the reel, (loosely) in my shed over winter. when i pulled my rod out for the year, the line just coiled off the reel.... whats a good suggestion for stretching the line to remove the memory?

this is my second year fly fishing, and i dont really want to go out and purchase another line... also, late fall last year i was fishing in a quarry behind my house, the water was a bit murky from the leaves.... i then realized they were walnut. i tried cleaning my line countless times, but it seems the walnut juice just wont let go...(running the line through warm water with dawn dish soap, and allowing to soak)

any suggestions?