I need to start doing this.If you have some issues with mold, I am told that a capful of bleach in the soaking bin with seeds should be enough to kill off any mold. As a preventative, I will also add a capful of bleach to my top watering bin every few days. I never really had any issues with mold in my fodder bins, but the tiny bit of bleach can't hurt and I see no signs of mold. For $1.00 a gallon of bleach at the Dollar Tree, it will last me more than a year with only a capful every few days.