Dread shampoo that ships from the UK
Dread Maintenance
well what i was told was, you use them, for laundry a few times, then you put them in a bag and yes you can boil them or just use them but they should be used a few times for other purposes before using as shampoo (i think...that's what i was told anyway)
the dreadlockshampoo.com ones really are the best
you can maybe try bronners but i think uk water sucks not only is it hard but alkaline too
bronners might work if your areas waters not too hard