When they try to chew it it breaks off and sticks into their cheeks and gums. Evidently it is very painful to them.
I did that and haven't had a problem since.
WWG1WGA
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican) had a problem since.
We have only had the one come into the house but I will put some where the drainpipe goes through the floor. I don’t want to relive that experience.
that was my grandfather’s solution back in the 50s. seemed to work for roaches also.