Thanks for your replies. I just tried bicarb and vinegar and nappies are on the line, not that it's very sunny so I don't think they'll dry.

I think I'm out of ideas. I was wondering if sard wonder soap would help. In the mean time I am single handedly draining the reservoirs of SE QLD, so I think I need to give up.

Detergent didn't work. I used detergent, a toothbrush and a whole lotta elbow grease and I barely made a dent on it. I don't know what the cream really is, maybe it's zinc cream, I don't have the old tube to check and I can't remember what it was called.

Anyway, don't have money for new nappies and can't afford disposables so I'll have to work with what I've got.