What is it about soapy water that knocks house flies right out of the air? <https://s10.postimg.org/t0p04p0h5/image.jpg
In case you want to know why, I use the flies to feed the plants. <https://s10.postimg.org/qw4n3mlzt/image.jpg
I'd rather not use soap (for the plants), but plain water doesn't work. <https://s10.postimg.org/gytmal1jd/image.jpg
How does a single soap drop of "flak" incapacitate a housefly? Do you think the dish soap is bad or good for the plants?