Shelf stable, home made OxiClean

I'm trying to wean my household off of commercial products (to save money, plastic, fossil fuels, etc.). Right now I'm trying to formulate a replacement for OxiClean, and this seems easy enough to do. The internet agrees with this formula:

    1 cup water
   1/2 cup hydrogen peroxide
   1/2 cup washing soda

However, this is supposed to last only 6 hours before losing effectiveness. But commercial OxiClean is something you can buy in a bottle and leave for months. Is that stuff, in fact, less effective too, or do they have a way to make it last, and how could I accomplish this at home?

Why not break it down so that you mix it as you add it to a load of clothes?

How much is required for 1 load?

Lets use 1/4 cup to make this simple. So you have a washer full of water so you don't need to add water.  Add 1/8 cup of hydrogen peroxide and 1/8 cup washing soda.  Or maybe mix the two together then add to the washer. Does this make sense?

Even if these protions are a lot more than you would of oxiclean, you could make smaller portions.

Ah, I wasn't being clear. I was talking about the pre-treatment kind of OxiClean, where you spray it directly on a stain and then leave it in the laundry hamper until wash time. Another usage of OxiClean is to brighten whites in the whole load, and your idea would indeed work for that scenario.