The poo residue happened to us with natural detergents. We use amway detergent now with no problems.
SAHM to my July 2007 DD and Sept 2010 DS, SAHWife to my DH. ISO: BG organic cotton aio, Sposoeasy L, Simplex L, all boysih/GN. Girls Stride Rite 13 or larger, Boys 6 or larger.