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Pest Expert Formula 'C' Cluster Fly Spray is a fast-acting cluster fly killer with a long-lasting residual that helps maintains long-lasting cluster fly control.
Pest Expert Formula 'C' is the most powerful cluster fly killer spray available to the amateur market, offering both fast-acting and long-lasting cluster fly control to help eradicate a cluster fly infestation in your home, loft or roof space.
Formula 'C' Cluster Fly Spray should be applied to any alighting surfaces including window frames and roof timbers. Cluster flies will die on contact with the invisible insecticidal residue, which is effective for up to 4 weeks, offering extended protection from cluster flies.
Formula 'C' Cluster Fly Spray is water-based and low-odour, making it perfectly suitable for use in homes with children and/or pets, provided they are kept out of the area being treated until all surfaces are dry (2-3 hours).
The active ingredient in Formula 'C' is the powerful broad spectrum insecticide cypermethrin (0.1% w/w), which is also effective against a wide range of flying and crawling insects.
Each 5-litre container is sufficient to treat an area of approx 100m2.
Directions for use
Lightly spray roof timbers, sash windows, Velux windows, window frames and any other alighting surfaces or cluster fly harbourages. Try to avoid cleaning these surfaces as this will remove the protective residue.
When carrying out a cluster fly treatment to a large area, we recommend using one of our Pressure Sprayers to enable an even distribution of the Formula 'C' insecticide and help you achieve a professional application (see Related Products below).
Best used following treatment with a fumigation device such as a Pest Expert Formula 'P' Fogger or Smoke Bomb to flush out the initial cluster fly infestation. We highly recommend our Cluster Fly Control Kits as they contain a combination of our best cluster fly killer products including Pest Expert Formula 'C' Cluster Fly Spray, Formula 'P' Foggers or Smoke Bombs and Pest Expert Formula 'P' Powder and offer better value for money than purchasing these items individually.