Have a general question about bugs and vermin. Since there is trash with food stuff left at the washes, it attracts things that bother me. I see ads for electronic devices that are supposed to drive the pests away with some type of ultrasonic sound. Since they are cheap, usually under $50, that's a lot better than a monthly service. Anyone have any experience with these things? If they did work, I would guess the licensed exterminators would use them rather than the chemicals that we unlicensed ones can't get. There are roaches down here in south FL that are as big as mice.