Yes the liver breaks down toxins. It's a chemical factory in your body that gets rid of dangerous substances. Afterwards you shit the leftovers out.
Have you heard about alcoholics having a broken liver or some drugs harming the liver? That's that. Too much work for the liver.
Sauna can still help but not for the toxins. Watch this very short video for kids narrated by a eastern European lady and imagine it's me.
https://youtu.be/OQZGsY52A70