Nitty Gritty Conditioning Defence Spray (250ml). Nitty Gritty Conditioning Defence Spray contains essential oils such as lavender oil, Tea Tree oil and Neem oil.. Everyone's hair has its own unique aroma – and just like mosquitoes, head lice use their sense of smell to detect the presence of 'new' hair during even very brief head-to-head contact. Our Nitty Gritty Conditioning Defence Spray doesn't just keep your hair in great condition, it also messes up their 'radar'; by masking your hair's unique aroma it encourages head lice to stay on their existing host rather than migrate.It's a carefully chosen blend of ingredients with a lovely grapefruit scent, that will not only keep those pesky lice at bay but keeps everyone's hair fragranced, soft, shiny, de-tangled and in tip-top condition. It's an eco- and family-friendly 250ml atomiser spray that will last for ages.. For all the family above the age of two.. Ingredients. Aqua, Polysorbate 20, Glycerin, Phenoxyethanol, PEG/PPG-18/18 Dimethicone, Citrus Grandis (Grapefruit) Peel Oil, Ethylhexylglycerin, Panthenol, Sodium Hydroxide, Lavandula Angustifolia (Lavender) Herb Oil, Melaleuca Alternifolia (Tea Tree) Leaf Oil, Melia Azadirachta (Neem) Seed Oil, Limonene+, Linalool+, Citral+