Also, they’re sensitive to moving shadows. As with motion sensors, if you move slowly enough, they cannot sense you. Slowly circle behind them and they jump into your death mitts.
Anyway, this has worked out better for me than a Bic lighter and hair spray. But that works too.
Orrrrrrrrrr, and hear me out…
You build a tiny replica house so that the fly isn’t homeless. Then he’ll leave you alone.
Build him a garage and leave the door open and watch him lose his mind trying to get one of his buddies out of it.