I use to buy a big "milk carton" of that charcoal, put it in an old sock and put it in the washer with my clothes when they got to the rinse cycle. I have no idea if it worked. I haven't done that in several years.

If my people, who are called by my name, will humble themselves and pray and seek my face and turn from their wicked ways, then will I hear from heaven and will forgive their sin and will heal their land. 2 Chronicles 7:14