I might wipe them every once in a while with a clean sponge, barely damp with water. No cleaner. No conditioner. Won't do any good. The ozone that is responsible for most of the degradation of rubber or foam is generated inside the cabinet by the electric field of the voice coil. It ain't much. But it has nowhere to go.
If you're really into it though you would use a nice brush and vacuum. Griot's Garage probably sells a whole kit for this. Lol!
If you're really into it though you would use a nice brush and vacuum. Griot's Garage probably sells a whole kit for this. Lol!