i have bought EcoStore sensitive powder - it's a bit more exxy but you use bugger all. most stuff is being prewashed with no detergent as it's not technically dirty, it's just to make sure there is no manufacturing residue...
I have washed some of my baby clothes and I used a sensitive powder and then on the second rinse I put some Huggies fabric softener in the water. I was told to do 2 rinses so that you make sure all the powder/detergent is not left in the clothes etc.
Bookmarks