Insect Repellent Gel Carr & Day & Martin £8.10 Quantity: at £8.10 each Out of Stock Out of stock. Long-lasting, weather resistant clear formula dries quickly and does not leave a residue.Use in conjunction with Carr&Day&Martin Natural Insect Repellent or FlyguardKey ingredients: Margosa extract – also known as Neem. It is a well known and researched natural insecticide and repellent and also has anti-fungal properties. Australian tea tree oil – has anti-bacterial and anti-fungal properties and is a well known and widely used repellent. D-limonene - an oil derived from citrus fruit, commonly oranges and has excellent insecticidal properties.