Why are my towels so stiff after washing?

In the water we usually use, there are some minerals that can be dissolved by water, such as calcium and magnesium. Among the soaps we use, there is a substance called sodium fatty acid. Sodium fatty acid meets the calcium and magnesium in the water and can become a precipitate that cannot be dissolved by water. These deposits remain in the fibers of the towel and the towel becomes hard.
If you want your towel to change back to softness, we offer some methods and hope to help:

How to clean towel?