It is very easy (takes about 10 minutes) and cheap. This batch is around $8 and will last many months. I make 3 batches a year.
Does it really work? It does. It will get your clothes clean and odor free.
container for your soap
-2 bars of Felt Naptha soap. Grate it up using a cheese grater.
-Box of Borax. Half of the box. Save the rest for your next batch (I poor the powder outuntil it feels like half)
-Box of Arm and Hammer Washing Soda. Again, half a box
Mix together in a bowl. Sometimes I have added a few scoops of Oxy Clean (or Biz).
Fill a container and pop in a tablespoon you aren't using (you can pick up all the tools from a thrift shop) . All you need to add to your washing machine is one teaspoon (I use a front loader. Not sure that makes a difference).
This recipe makes a large batch and I keep what doesn't fit in my glass container in an empty oatmeal tube.
That's all, super easy and inexpensive