Powdered Laundry Detergent

I trade off between this and a laundry detergent that I purchase because it usually takes me a couple of weeks to make a new batch even though it is SUPER EASY!  I feel like this detergent gets my clothes clean and it is incredibly cheap to make.  I especially like to have all of the ingredients in my storage.  Because it has no fillers, it uses FAR less per batch and therefore lasts much longer.  

1  4 lb. box Borax
1  4 lb. box Baking Soda
1  4 lb. box Washing Soda
3 bars Fels Naptha or 2 bars Zote
3.5 lbs. Oxyclean (approx.)
Laundry Crystals or Fabric Softener Pellets (optional)

Finely grate Fels naptha or Zote.  Mix altogether.  Use 2 TBSP per batch.  It's tempting to use more because 2 TBSP doesn't seem like enough, but this soap has no fillers and it really only needs 2 TBSP!