My sister's kids (aged 4 and 3) are mixed race with very curly hair. They have a very bad nit infestation which seems impossible to clear up. We have tried all the various products from the chemist with very little success. By combing daily (a nightmare job getting them to sit still that long)we can keep the numbers down but they keep returning! We may shave the boy's hair but feel that would be too cruel for the girl who has just started school. My friend suggested using diluted sheep dip carefully. This sounds like a very dodgy idea to me but we are desperate. Does anyone have any better ideas? Thanks