I had a look at the ingredients in RG and it's main ingredient is washing soda which I stick in with my nappies/clothes anyway. Yet to have a stain not come out and it costs $3 for a kilo. I don't know if the extra $17 plus postage for RG is worth it to be honest. Using plain washing soda would be a better option for those who've got rashes too because I bet it's the surfactants (like citric acid etc.) that cause the irritation.
The weird thing with my DS he doesn't react in the nappy area he can't be normal in that but reacts elsewhere. It seems almost down this morning after putting the steriod cream on it last night and once this morning. So hopefully after a strip wash we solve that problem, if it doesn't I know it's the dairy at least. (I haven't washed anything else of his in the RG so )