吉浦 ル. 5 The house we rent is gorgeous, but the bathroom sink tends to get these annoying flying insects around the overflow drain. This product really did the job, after following the instructions of shaking the can and turning the lid to the “On” position. The mouth of the can fits snug right over the main drain of the sink, one stern long held pump to get foam action started did the trick. All that nasty overflow drain gunk came out as did anything living in there. I did use 2 cans for the drain, I mean separately of course. Like the theme from “Zombieland”, I’m a firm believer in “Double Tap” ....