Unwinterized, uncovered pool

Apr 28, 2018
chillicothe, ohio
I need to open a pool that was not winterized or covered during this past winter. The water is green and most likely has an abundance of leaved collected at the bottom of the pool. It is a 27'x54" above ground round pool. What steps should I follow to clean it up? I would like to drain and start over but i am affraid of hurting the liner.