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Using a large cookie sheet and spread a box of baking soda on it. Put it in the oven at 400 degrees F for 1 hour. Let it cool and you have your own washing soda for much cheaper.
Hi - I am not really sure about how much saving after using my oven at 400 for an hour. Of course I usually just use a small amount of "soap" and add baking soda out of the box. Works great and not very expensive.