+1 on Dawn and 5 Gallon Bucket
Done this several times just rinse very well and hang to dry
"HANGING OUT" has taken on a whole NEW MEANING
Most UK sites I've been on when looking at ripstop say to wash it at 40C (104f) so that's what I'll be doing when minequality needs a wash. If your hammock has a dwr don't use fabric softener and it should be fine.
Hope this helps.