Cockroaches contaminate and spoil human food. They eat starch and glue, and thus may damage fabrics, garments, curtains, books, papers and many other materials. Good housekeeping and using an insecticide when necessary are the only certain means of keeping your home free of cockroaches. You can use a household surface spray or a dust. For severe infestation, use both.
Some sprays have attachments to help direct spray materials into cracks and crevices.
Apply enough spray to moisten surfaces thoroughly, but not enough to drip or run. This material doesn't kill the roaches, but it will flush them into the open where they contact a residual surface spray or dust. Baits work well to keep a population under control after using an insecticide. Put out a good number of baits. For best results, place them where the roaches live.