BugClear Ultra Gun. Insecticide has a contact and systemic action insecticide offering a broad spectrum of pest control for flowering plants. Protects for up to 3 weeks. It kills all major ornamental insect pests including whitefly, greenfly, blackfly, red spider mite, caterpillars and lily beetle, scale insects and mealy bugs. BugClear Ultra Gun. Insecticide Gives a useful level of control of thrips. BugClear Ultra Gun. Insecticide is suitable for use indoors and outdoors. Use indoors all year round. Use outdoors between April and September.