We have used Ortho Snake-B-Gone before and it does work but, like you say, come the rain and it just B-Gone.
Ok, I gotta ask... how do folks know this works?? Have they actually seen snakes approach it and turn away?The problem with sulfur is that it is poison. Things like the Ortho product are safe around animals and kids. They work by confusing the snakes sense of smell which confuses the snake and it slithers away. Also, the snake is still around, just not in the area where you spread the product.