Steve writes
I've heard that with sprays, they are soaked into the concrete and not as effective.
Ultracide does work on nearly all surfaces, including concrete floors. Since concrete floors are very porous, an aerosol works well because the particle size of the product is so small it can evenly coat the porous surface and work its way in tiny cracks and crevices where the fleas like to lay their eggs. If you were to look at concrete under a microscope, it would look like the moon, full of large cracks and crevices and crater like indentations. Aerosol particles are so small they can fill these quite easily and therefore work very well on concrete surfaces.
Answer last updated on: 11/04/2009
