I always suggest using liquid castille soap/water combo in a spray bottle (ratio of 1:1)
Have used it on dd1's hair in the past, only needed to use it once but can't guarantee that would always be the case.
Prior to using this method I also used conditioner/combing but avoided using chemicals.
I found using the castille soap effective & much less of a faff than combing.
If you decide to go with using castille soap/water solution this is the method:
- section dry hair into workable sections
- one section at a time, spray the solution all over the scalp, then thoroughly work into the scalp & hair
- keep going until all sections covered & hair is saturated with solution (which will have lathered up & wet the hair as you work it in)
- cover hair with towel for at least 1/2 hour but longer if possible (to make sure!) it may start to sting the scalp after too long tho' particularly if there is any broken skin
- after these steps simply rinse hair thoroughly with shower head...I did this step over the bath with the plug in to see what was rinsed out.
- you can repeat the above steps within 3 days to check you have killed them all & keep going with this until you have.
When I did this I found it so effective that on the subsequent applications there was nothing there, may have been luck!
Word of warning - pure castille soap will sting the eyes so always best to keep eyes guarded from spray & run off as you are treating the hair.
I use Dr Bronners Baby Mild liquid castille soap, we use this as our regular soap anyway. Castille soap kills by destroying the exoskeleton, so works on aphids, ants etc too.
Anyway, up to you, but I would say it's worth a shot, particularly as you are treating everyone in your family as this is a much quicker method than combing, and less harsh than the commercial chemical based products.
Good luck 