First time dealing with nits - help

[RooTwo]

My DD (4) has picked up nits from nursery, and I have got them and possibly DP and DS too (2). We treated with Full Marks 10 min solution on Monday and combed through, and did it again on Weds and yesterday.

The Nitty Gritty does not get them all out though - I have to pick through her dry hair to actually take the eggs out by hand ( have just spent an HOUR doing this this morning, and I am sure I have not got all of them). When I've tried using conditioner and then combing, the conditioner just seems to clog up the comb too much and get a bit foamy so I can't see what I'm getting out.
PLEASE can someone help with the most effective way of getting rid of these buggers! My hair is long and I am despairing of ever getting them out (seeing as poor DP has to do it). Should we consider using a real chemical buster on all of us? Hedrin or something?

Thank you in advance!

Have you use one of those very fine toothed "nit combs" to comb through? This should dislodge them all as it's finer than a regular comb. Full Marks, Hedrin etc only kill off the lice and live eggs they don't remove them which is why you need a special comb. From what I remember this can be a timely and uncomfortable process.