jenya19, i used to have a problem with mice and cockroaches. ended laying traps and putting down about five courses of strong insecticide and basef gell. I got rid of the main problem of cockroaches after about five treatments of insecticide all over the house over the space of about three months.
i now use these US Plug Pest Control Summer Electronic Ultrasonic Pest Repellent Anti Mosquito Insect Mouse Repeller Killer No Noise.
Not seen any cockroaches or mice for over a year now, fingers crossed they're gone for good.