They have come in to spray (a few months back), but it is a localized spray. It was only along the bottom of the front and sliding glass doors and the kitchen under appliances. It is not a spray that goes up into the air and likey we did not track it into the snake room. Also, the spraying does not coincide with any of the deaths. I do believe we share ventilation but there have been no sprayings for a while. If there was some kind of pesticide in the air, I'm pretty sure my bird would begin to exhibit some kind of symptoms as I've been told birds are extremely sensitive to that sort of thing. She is housed in the same room as the snakes. Her health and behavior are completely normal.
We clean the tubs with dawn dish soap and hot water. I've only recently began using bleach (after his death, I bleached everything) The other cleaners we use around the apartment are non-toxic, pet safe cleaners. We use Febreeze in the rest of the apartment, but do not spray it in the snake room.