A comment
I began to notice that after washing all the clothes in the literal sense of the word became “oak”. Additional rinsing, all kinds of conditioners, nothing saved the situation. I deduced that the problem could be related to the accumulated limescale in the pipes of the washing machine. At the same forum, I found out that you can solve the problem with the most ordinary citric acid, I decided to try and see what happens.
In general, I poured a bag of citric acid into an empty drum (about 10 grams), and set the operating mode to boiling at 90 degrees. I liked the result, now clothes after washing have become much softer. I decided to continue to do this procedure every six months, for the sake of prevention. It helps, and the costs of cleaning limescale are cheap. So, I recommend trying, at least I saw the result!
Minuses
don't know anything about side effects