Treehugger
Maybe it doesn't really clean the brush? Though it sort of sounds like it should when I read about this product in English. Says that one should dip the tip into the solution for 24 hours.

I know you can buy some products that restore a brush, by dipping the tip of the brush into a gel, and that way making the brush tip retain its shape until next use.

Augie
When I need to "restore" a brush, I mix my own that works well, but the mix is a little spicy

Maros Kuzar
I use paint removers to restore brushes, but my wife got me this product in hope that maybe it is less agressive and gives brush it's original shape. TBH you better use clear water than this "magic potion", it might be a better choice.

Reading review (link bellow) it seems like author got very nice result. Don't know what is going on, I am trying to make it work for the 10th time or so, left brushes in it for hours, days, even weeks, and it hadrly loosened dried colour residues, and did not allow me to shape brush tip to original shape (maybe because those residues? 😄).