At this time of year, flies are getting to be a pain. Sometimes they will obligingly scoot out of a window you kindly open for them but, as often as not, they instead retreat deeper into the house. It wouldn’t be a problem if they were well behaved houseguests but their hygiene habits leave something to be desired.
Last night I even went as far as buying a few strips of fly paper but today I have seen a brilliant solution: Bug-a-Salt. I would still try opening the window first but, if it failed, this would be an excellent backup plan.