We use the mighty bubbles every 4 weeks right after we do a tub clean on the washer. I think the bag says every 6-8 weeks but we have found this fits into our routine easier and keeps the diapers stain and stink free without having to think about it too much. After we do a tub clean, the next 2 loads of diapers get a MB treatment. Makes our simple wash routine really simple!
This is a must have for wash routine. I mighty bubble once a month to remove build up and/or smells. Its a great way to refresh diapers. I also used it on regular laundry especially on the towles, dish cloths, and napkins. Also depending on the smell/build up you might need to do a second round of mighty bubbles.