Drained above ground pool sun made everything left in it hard how do I soften up or have to replace liner?

To soften a hardened above-ground pool liner due to sun exposure and make it flexible again, you can try the following methods:

Heat the Liner: Use a hair dryer or heat gun to gently warm the hardened areas of the liner. The heat will help soften the material and make it more pliable. Be careful not to apply too much heat, as this could damage the liner.

Alcohol Solution: Prepare a mixture of rubbing alcohol and water in a 1:1 ratio. Spray this solution onto the hardened areas of the liner and let it sit for a few minutes. The alcohol will help dissolve the hardened residues, making the liner softer.

Vinegar Solution: Mix equal parts vinegar and hot water. Spray or pour this solution onto the hardened areas of the liner and let it sit for several minutes. The acidity of the vinegar will help break down the mineral deposits.

Borax Solution: Dissolve borax powder in hot water to create a cleaning solution. Spray the borax solution onto the hardened areas of the liner and let it sit for 15-20 minutes. Borax is an effective cleaning agent that helps remove dirt and grime.

Commercial Pool Liner Conditioner: You can also consider using a commercial pool liner conditioner designed to soften and protect the liner. Follow the manufacturer's instructions for proper application.

After softening the hardened areas, rinse the liner thoroughly with clean water and allow it to dry completely. Avoid leaving any cleaning solutions on the liner, as they may cause further damage.

If the liner is extremely damaged and beyond repair, you may need to replace it. Consult with a professional pool maintenance provider to assess the condition of the liner and determine the best course of action.