There are a few ways to get memory out of leader line. One is to soak the line in hot water for a few minutes. This will help to loosen up the fibers and make them more pliable. Another way is to use a leaders mitt or glove. This device helps to grip the line and work out any kinks or twists. Finally, you can also try using a weighted leader straightener. This tool attaches to your fishing rod and uses weight to help straighten out the line.