To keep wool soft when washing it, you should follow these steps:
Use a mild detergent formulated for wool or mild baby shampoo. Avoid using detergents that contain bleach or enzymes.
Hand wash or use the delicate cycle on your washing machine using cold water. Avoid the use of hot water, as it can shrink and damage the wool fibers.
Be gentle when agitating the wool during the wash cycle, as excessive agitation can cause the fibers to felted and shrink.
Rinse the wool thoroughly in cold water, ensuring all the soap is removed.
Gently squeeze out any excess water, but do not wring or twist the wool.
Lay the wool flat to dry, away from direct sunlight or heat sources. Never hang wet wool, as gravity will stretch and misshape it.
Once the wool is dry, use a soft brush or comb to restore its natural softness.
If you want to be extra cautious, use a fabric softener in the final rinse, or add a few drops of essential oil like lavender or eucalyptus to help soften the wool.
It's always best to check the care label on the woolen garment or check with the manufacturer for the best way to care for the specific item you have.