I would suggest to simply soak it in a bucket. This way you are not spraying it all over the place either. As always - use as directed, wear gloves etc. A gentle toothbrush will dislodge dead bugs after the treatment.
Btw regarding the "Big Guns" - the active ingredient in the Bayer stuff is Imidacloprid which is also used in Flea collars for Dogs, see Advantix.
