Yeah, that is what I was seeing, too, Bettacreek. I guess a bit of extra baking soda and a little more washing soda should work.
I have been using my naptha bar for stains, and it has worked very well... with the exception of my work polo shirt. I dripped some grease from something I was eating on it, and the first run through the washer (cold water only always) it didn't get treated, and then this run through the washer I remembered to rub the bar on it, but it still doesn't look like it has come out. My work polos are never dried, either, so I know that isn't the issue...
Not that it is a big deal, I think we're getting new shirts soon, which would be nice as the quality of these has been terrible.