How to manipulate Project Tango's dynamic generated meshes

I'm working with Unity 5 and Project Tango SDK Izar. My project is based on the ExperimentalMeshBuilderWithPhysics example. I saw that the meshes are never destroyed, so if something passes in front of the camera the mesh generated will continue to exist also when the space in the front of the camera will be free. Does someone know if there is a way to destroy "old" meshes? Like a destruction timer or some other way to "refresh" meshes?