Once you drain, if the liner is stiff and brittle . . . forget it. Otherwise, maybe.
+ When you get to maybe 4" water left, add a couple of gallons of PLAIN 6% bleach, and a cup of liquid laundry detergent. Spray the sides down, and scrub the pool with a pool brush.
+ Pump that out, and refill with 2". Add another gallon of bleach, and re-scrub.
+ Be EXCEEDINGLY careful about the walls; they can fall inwards damaging the structure and the liner. You may need to brace them, or tie them back.
Good luck!
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