House flies, many flesh flies, bottle flies, and blow flies breed in organic debris such as garbage, animal excrement and decaying organic materials. If you remove these sources, many times you have solved your fly infestation problem. Garbage cans and dumpsters can be a challenge to maintain a clean surface. Use a tight fitting lid on these receptacles if it is available.
Invade Bio Zap may be used in garbage cans, trash compactors, and dumpsters to kill the debris and scum that increases a fly population.
Residual Insecticide spraying is another method of chemical fly control. Recommended residual insecticides are Cyper WP or D-Fense SC which belong to the pyrethroid family. Apply it as a course, wet spray to the surface areas where the flies would rest. Such places may be porches, garbage cans, chairs, sun-exposed surfaces on outside walls, kennels, etc. Pets should be removed from area before spraying.