Thanks for this tip, I just tried it out. Very nice.
While looking for instructions on how to make the solution (which I ended up ignoring), I came across a tip to add baking soda to laundry detergent. 1/2 cup for top-loading, 1/4 cup for front-loading washing machines. Has anyone tried that and what are the results? I can see benefits for whites, what about colors? The site says it's supposed to make colors brighter, but I'm afraid it might wash them out.