Best cockroach killer

There are lots of cockroaches in our house and I have tried everything from all coopex powders, sprays, gels but they just won't die 🥹😭 Can anyone give any recs please.. It might be due to the dirty dishes left by my siblings at night that they don't die. I always try to clean the kitchen completely before sleeping but my siblings eat late night and just keep their plates with leftover food in the kitchen. Iss ka koi hal ho toh woh bhi bataden 😭🙏🏽