Against pests such as cockroaches, spiders or even silverfish, diatomaceous earth can work wonders. To use this powder, which is particularly effective against spiders, mix it with floor washing water and then mop the floor throughout the house if necessary. You can also spread dust around doorways and windows. Diatomaceous earth also works very well against fleas and bed bugs.
Adding these products to floor washing water is one of the smartest ways to keep bugs away while you clean your home.