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If you’re using the same container you shampooed the hair in, dump out the soapy mixture and clean the tub. Then, fill it up with enough cool or lukewarm water to cover the hair completely. Using conditioner will prevent the hair from tangling while helping it stay soft and shiny. Fabric softener will make the hair significantly softer, but it will not address tangling, clumping, or similar issues. If you’re using conditioner, look for products labeled as ‘synthetic safe’ or something similar. Fully stretch out the synthetic hair, then set it in the solution. Press the hair down until it is fully submerged, then leave it in the water for at least 10 minutes. For damaged hair, try soaking it for 30 minutes, an hour, or even a full night. Just like when you shampooed it, move the hair up and down and from side to side, making sure every strand gets covered with conditioner or fabric softener. To avoid unnecessary damage, do not rub the hair or handle it harshly. If you’re letting the hair sit for a long time, you only need to agitate it for the first 5 to 10 minutes. When you’re ready to dry the hair, remove it from the tub. Leave any remaining conditioner or fabric softener in, that way the hair can continue to absorb it.

Summary:
Fill a tub with cool water. Mix in .5 cups (120 ml) of conditioner or fabric softener. Place the hair in the tub for at least 10 minutes. Agitate the hair by swishing it around in the water. Remove the hair but do not rinse out the conditioner or fabric softener.