Smidge Insect and Mosquito repellent is one of the best on the market. The safe alternative to DEET. Smidge with Saltidin® is one of a new generation of powerful repellents developed as a safe alternative to DEET. Not only is it skin-friendly and suitable for children as young as 30 months. It won’t melt your plastic watch or nail varnish and is proven to be as effective as DEET for up to 8 hours.