Ok so I've got rat racks in my garage and when I keep the garage door open when going in or out or cleaning the tubs there seams to be alot of flys in the garage when the roller is down. Then they are stuck in there. And with an internal door to my house they get inside and I can't handle it no more lol. Has anyone tried one of those sensor units from Woolworths that spray every 15 to 30 min to kill insects? Would it do any harm to my rats or baby's ? Not to mention the residue that's in or on the rats would it harm my snakes when feeding? Thanks braids