My stupid college housing forgot to install a bug screen on my window (we have at least 300 rooms and mine was the only one forgotten. I didn't even know rooms were installed with bug screens) and now my room is being overtaken by flies. I don't have vinegar, so I can't use the vinegar and cup trick. There is absolutely no way I am going out of my way to Wallmart o buy one bottle of vinegar, no. I am not catching 50+ flies with my hands either. Any advice from mothers?