You put two-sided tape on the aluminum foil and tape it to the counter (it's temporary). Like I said, they hate the noise. Once they hear that noise (you can also use some kind of paper that "crackles") they'll associate the bad noise with the counter and avoid it.

They don't like citrus smells, moth balls (do not put them loose, enclose them in a netted lingerie bag so they can't chew on them, not that they will) and cedar.

Good luck!!