Well, no matter what kind of bug it is PAM will kill it, but clean out the enclosure as you mentioned and that should help, but won't guarantee that the bugs will be gone.
Here is one company you can buy PAM from.
http://www.pro-products.com/
Jut a tip to you about those half logs though - they are not very good hides for bps because they are very open. You may want to simply try some plastic bowls flipped over with holes cut out, or even margarine containers. I know the log hides LOOK nice and are very natural, but they aren't the best for your bps security. And you do have 2 right?