Err, and underfoot so they don't hook up when jibbing...
A smooth rock, nail file, or even the metal poles of a ski stand will work pretty good for just taking the 'edge' off your edge... as such. Unless you're spending all day smashing rails you probably don't want to detune them all that much though as they'll suck for regular skiing.
If you're skiing them all over the place, just don't bother tuning them, maybe de-burr a couple of times a season and that's about it.