I AM SUFFERING FROM COCKROACHES SINCE 7 YEARS,I TRIED MANY CHEMICAL SPRAYS FRO THE MARKET BUT IT DIDNT WORK.WHAT WAS SOMEHOW EFFECTIVE IS A COCKROACH PASTE,IT IS SOLD EVEN IN SMALL SUPERMARKETS ,IT IS A PASTE WHERE YOU PUT IN THE CORNERS,HOWEVER YOU HAVE TO FIND OUT WHERE DO THEY LIVE IN YOUR VILLA,YOU HAVE TO FOLLOW THEM AND WATCH THEM TO FIND WHERE DO THEY REPRODUCE,DONT LAUGH BECAUSE I SWARE THIS WAS THE ONLY WAY TO GET RID OF THEM,ALSO WHEN YOU SEE ONE OF THEM FIND OUT IF SHE WAS THE PREGNANT MOTHER AND YOU WILL NOTICE THIS FROM THE EGGS AT THE BACK OF ITS BODY,THIS ONE SPECIALLY YOU HAVE TO KILL BECAUSE SHE IS HOLDING LOTS OF BABIES WHO WILL REPRODUCE ANOTHER HUNDREDS IN TWO WEEKS.SORRY FOR THE LONG DETAIS BUT THIS WAS MY EXPERIENCE.ONE MORE THING ALL MY FREINDS TRIED THE COMPANIES BUT IT REAPPEARED VERY SOON.ALWAYS LOOK AT THE BACK OF AND UNDER YOUR FRIDGE AND COOK.GOOD LUCK