Somewhere I think I read to use 1/2 scoop for regular clothes and stuff, and 2 Tablespoons for dipes. Then I measured 2 Tablespoons into the scoop, and low and behold 2 T. *is* half a scoop. *sigh*
So, I have no idea.

I've been using 1/2 scoop for everything, including dipes. But I have super hard water, so maybe I need it. (And granted I've only been prepping dipes-- no baby yet.)