not used it but I would be wary of using anything that the manufacturer refuses to say what is in the product. It probably is mostly sodium carbonate- washing soda but I'd still want to be sure.
When mine were in nappies I used a mix of washing soda and borax which worked brilliantly. ( I used a couple of tablespoons of each but experiment) You can't buy borax in shops now only borax substitute which isn't as good but you can buy it easily and cheaply from ebay. Borax also very very good for removing odours from food storage stuff, flasks etc and for soaking dishclothes and mops in