Okay I don't have the excact numbers.So pour about a capful of ammonia for every 1/2 or full cup of water (better to go with full cup)and they should die right away.Please give me feedback.
For the control of house flies that might be coming in through the air condition ductwork, try this. Take some window screen material, made of plastic and fiber, and place over the hole in the floor after first removing the vent cover. Next slowly reinsert the cover allowing the fiber material to sink into the hole under the vent. Trim the excess with a razor or a pair of scissors. This worked great at our home.
My grandmothers remedy, its pretty simple, just put a penny in a plastic zip lock bag of water and hang it on the wall, outside or where ever the problem occurs, it seems to work out well for my family.
To kill flys, bees, hornets and wasps, spray with Windex. On housefly's it usually only takes a small whiff to knock them out of the air and kill them. Wasps will fall right away too but you may need to hit them with another dose. Ants can be discouraged by spraying around doors and windows as well as on the ants themselves though I think there are other products that work better for them... it's not bad in a pinch. :)
basil plants by the door will rid u of the flies. i've been bother by house flies for years even have chemial sprayer on my carport to no relief. then read article about basil, flies can't stand the smell. my carport was covered every day with them got inside my house i was killing them all the time anywhere from 50 - 75 everyday. bought sweet basil plants and placed 1 by the carport door and 1 on a table and then no more flies has worked all summer. i had flies where we live for the past 16 years this is the first year i not gone crazy over the flies inthe house.
Everybody hates those fruit flies or knats. I always use apple cidar vinager. Put some in a bowl with a drop of dawn dishsoap and place it where the flies are. They love it and it also helps with bad odors.
FOR FRUIT FLIES: MIX ONE CUP OF WATER, A FOURTH CUP OF WHITE VINEGAR AND 4 DROPS OF DAWN SOAP (USE ONLY DAWN BRAND)IN A PINT SIZE JAR. POLK HOLES IN THE LID BIG ENOUGH FOR THE BUG TO GO THROUGH. MIX AND SET WHERE NEEDED. THE FRUIT FLIES WILL GO TO IT.IT WORKS WE USE IT IN OUR STORE DURING THE SUMMER MONTHS.
For indoor flys don't use a fly swatter. Instead get an empty spray bottle. Fill almost full of water. Add about a cap or two full of dish liquid soap enough to turn water yellow. Shake. Now spray flys and they will die. You can even spray them in the air. Spray and kill any type of insect like roaches etc.
Fill sandwich baggie half full of water, hang over any door which leads from outside to inside (hang bag over outside of door). The fly sees its reflection in the water & is scared off. Know it sounds crazy, but it works. Try it!!
To kill 1000's of flys cheaply and quickly out by the garbage, take a standard pickle or mason glass jar. 2/3 fill it with water, and chuck a piece of chicken in it. Poke a hole in the lid a little larger than a pencil. Nothing will happen until the meat rots. Then on hot days hundreds of flys a day will climb into the trap and be killed and or drowned.
Picture and public domain information @ www.bugtraps.org