I would just leave the cone alone. The smell will fade, and messing with it will make it worse.
Dog pissed on speaker
Any suggestions for how to remove dog piss from speaker, including on paper cone? Klipsch Heresy IV. It still has faint smell, and if I can still smell it must be strong to the dog. Dog has stopped peeing there but I’m still concerned he might again, driven by the smell. And if I get rid of the speakers, who would buy it?