That's just what I thought, Lixy - a thread about chocolate!
I have never sorted washing like that, unless there is something new which I suspect will lose dye, in which case I either wash it by hand to check, or put it in the machine with dark colours and a white cloth or something which will show up if there is a problem. I use BioD laundry liquid for everything. Some of you must spend an awful lot of time, effort and money on different kinds of wash, but each to her own!
As for nappies, they were done by themselves in a hot wash after soaking in the appropriate stuff, and like Mazgg, I loved seeing them blowing on the line. 