I'm also considering cooking up my own "magic wash," which consists of future, water, and acrylic paint for pigment. I could be wrong, but I'm just guessing that a solution like that is what this guy uses:
Still working with the AP on some Old Glory skirmishing stands:
I'll be sure to post a full report when done. I will say that I like AP as a wash for white/ivory colors, because I prefer the warm shade tones. We'll see what happens with this bunch.