Vinegar does not actually kill all types of bugs, but it can serve as a serious deterrent to their enjoyment of your happy home. Even if you employ a regular pest-control service, you may find that after a few days the bugs magically appear as if they had not been driven out and--in theory--killed by the exterminator. One of the reasons that roaches, beetles and other pests are able to exhibit this seeming imperviousness to poison is that they retreat to the safely and comfort of your kitchen drain until the onslaught has worn off. In order to drive them away or kill them completely, you must eliminate this safe haven.
Fill a large bowl with vinegar. Do not fill it to the brim, as you will be soaking the washcloths in it.
Place the washcloths in the bowl and allow them to soak for at least 5 minutes. The cloths must be saturated or the bugs will crawl out from under them and escape.
Place a vinegar-soaked washcloth over every drain in your house. You should do this on a day when you can open some windows, as your house will smell very strongly of vinegar.
Pour at least one cup of vinegar through the washcloth. If possible, avoid using the sinks and drains you have treated for several hours. If you must use one of the sinks, replace the washcloth immediately and pour more vinegar through the pipes to make sure that the water did not dilute the treatment.
Remove the washcloths after several hours. Do not rinse out the sinks, but wait for normal use to disperse the vinegar. This treatment will kill some bugs and drive others either outside or into areas of your house that have been treated by an exterminator. Either way, they should cease to be a problem for you.