1.) close the window, or put a screen in it...patch the holes in the floor too..
2.) change brand/type of litter box stuff
3.) Clean up all them half empty DD cups and bags!! coffee milk and sugar attracts flies too!
4.) Get rid of cat, I know, not easy, but it may be time...flies might be tellin you it's on the way --->out....
5.) thougrough cleaning vacuaming of entire basement, hoe out all corners, etc. including the ceiling, if insulated, pull it down, and look above it...wear a resperator while doing all this... lord nows what ya might find.
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