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.