How long will mothballs keep snakes away?

Answer:
Having not been previously aware that they did...

The thing that makes mothballs work on moths is the same thing that makes them smell, so a good rule of thumb is that if you can't smell them anymore it's probably time to replace them.

First answer by Ptorquemada. Last edit by Ptorquemada. Contributor trust: 551 [recommend contributor recommended]. Question popularity: 83 [recommend question].