Highly recommended are our Cluster Fly Control Kits, which contain a number of products including a Pest Expert Formula 'C' Cluster Fly Killer Spray, Rentokil Insectrol Cluster Fly Killer Powder and either Pest Expert Formula 'P' Foggers or Insecticidal Smoke Generators, along with an advice sheet giving step-by-step instructions on how to carry out a professional cluster fly treatment.

To see our full range of Cluster Fly Treatment products, please click on the 'Cluster Fly Products' tab in top left corner.

1.       Any unprotected persons or pets (including fish) should be removed from rooms where treatment is about to take place and kept out until smoke disperses and surfaces become dry. Any water storage tanks should ideally be covered. We recommend that a safety mask and gloves are worn at all times when handling any pesticides.

2.       Check roof spaces for bats or evidence of bats. If you find evidence of bats then you are obliged by law to contact either English Nature, Scottish Natural Heritage or the Countryside Council for Wales, as appropriate, before carrying out any insecticidal treatment to the area. Advice can also be obtained from the Bat Conservation Society on 0845 1300 228.

3.       Before fumigating, calculate the volume of the room or roof space to be treated and use the dosage appropriate to this volume according to the recommendations for flying insects. Apply at a rate of one Fogger per 150m³ or one smoke generator per 120m³.

4.       Activate Foggers or smoke generators according to the instructions on the packaging. If using smoke generators it is advisable to contact the fire brigade before igniting as they may be called out if a neighbour or passer by notices smoke escaping from the property. Please be sure to place smoke generators on a non-flammable surface, for example a biscuit tin lid or an old plate. Handle with care after use as these can become quite hot. Vacate the area for a few hours to allow the gas/smoke to disperse.

5.       Once gas/smoke has dispersed, apply Formula C spray to timbers and alighting surfaces within the roof space, paying particular attention to areas where heaviest infestation was noticed prior to smoke treatment. Formula C is also ideal for application to windows and window frames in the roof space or in affected rooms at a lower level of the property. As Formula C is a residual insecticide, it will leave an invisible film that remains effective for up to 3-4 weeks after application; after this time it may be necessary to re-apply. For maximum effect, avoid cleaning treated areas for a short time after application. NB Do NOT apply any liquids on or near any electrical items or power source, being sure to avoid plug sockets, cables etc.

6.       Insectrol Powder should be applied to timbers and alighting surfaces within a roof space. Insecticidal powder can also be applied with caution around electrical items and power sockets etc. Due to the nature of the product, the residual effect of the dust tends to be longer-lasting than the spray. Caution should be exercised when applying the dust, avoiding contact with skin and eyes, especially if applying at or above head height.

7.       When finished with, please dispose of any remaining product safely in accordance with advice on packaging.

To see our full range of Cluster Fly Treatment products, please click on the 'Cluster Fly Products' tab in top left corner.