I've never heard of doing anything like that. No one in our dojo treats or does anything to their jo/ ken. Some people make or buy bags, but there's no real standard.
I'm kinda curious, how much wear and tear do most weapons get in Aikido. After a couple years of kali, I stopped worrying about nice practice weapons because sticks would start to shatter or shred (meaning you had to tape 'em up... alot) fairly soon. Nothing is worse than spending money on a good set of sticks and breaking them the next day.