Signs you have a cockroach infestation
Faeces - The insects produce small black pepper like droppings. Larger species excrete cylindrical faeces. You may be able to smell the strange musty odour cockroaches produce.
Eggs - Eggs and egg cases might be found behind and under furniture.
Skin fragments - These are more difficult to spot in the roaches’ dark hiding places.
Live roaches - They breed in a matter of weeks, so you may see them in their numbers if you switch on the light at night. Roaches will nibble at books and food packages.