They deliver clean nappies each week and then pick up the dirty ones, it saves you having to wash them! It is more expensive than washing them yourself but it would save you having to buy a lot of nappies just to see if it helped. It depends where you live but have a look at this
http://www.cottontails.co.uk/index.htmlThey do a home trial pack as well, so they would lend you the nappies for 2 weeks to wash at home and see how you got on.