Dethlac Insect Killer 250ml is an ingenious tried and trusted insect killer for combating crawling insects such as ants, cockroaches & woodlice. Once sprayed this product dries to a hard clear film deterring and killing insect that come into contact with it. Can be applied to any non-absorbent surface indoors or outdoors in the garden, this rain-proof formulation remains effective for months even after being washed with detergent. Ideal for applications to doors, window frames (not UPVC), skirting boards, shelves, patios and any cracks and crevices where insects may hide or enter your building.