Have never used washing soda.I do use baking soda to wash all my huntin clothes and newly purchased deer stand camo material.I put 1/2-1 full box(the small $.30-$.40 box)in large load and double rinse,drip dry only.

Off Topic;
After each hunt I put all my clothes and boots in a large construction bag filled with cedar branches.Them Deer never know I'm around.AL