Help!!

We've had brown dirty water coming through all our pipes on and off since late last week. Stupidly, just after we noticed the water change colour, I did a load of nappies, not thinking and they came out with either dirt on them or are a grey 'dirty' colour all over. I have waited for times when the water is clear since then and they have had another 3 washes through the machine. There has been some improvement in that the dirt streaks are gone but they still look unclean and 'grey'.

Should I just keep washing them through a normal cycle and try to get them into the sun or is there anything I can soak them in safely without making them waterproof?

They are pocket nappies - Green Kids and Ecobubs mainly. I don't want to put them back on DS until they are clean and nearly half my stash is affected

TIA.