Critterkill Strong Flea Killer Spray - Use on Pet Bedding, Bedding, Carpets and More. How to use Critterkill Strong Flea Killer. The Stong Flea spray is the only HSE approved spray permitted and safe for use on pet bedding and mattresses with a ready to use dual active ingredients, 0.04% Imiprothrin and 0.06% Cyphenothrin.
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