For high traffic areas we recommend our Roman Clay Topcoat sealer. This sealer will protect from basic dirt and wear. It is not resistant to some oils or liquids - so it is not recommended for areas with constant direct contact with water, or where grease or harsh chemicals might come in contact (i.e. kitchen backsplash).
As long as the sealer (Roman Clay Topcoat) has been applied on top of the Roman Clay it is washable with light cleaning detergents. I prefer to use a little mild dish soap in warm water with the soft side of a sponge to clean scuffs.
We would also recommend re-applying the sealer every year or so just to add an extra layer of protection if the Roman Clay is in high traffic areas.
Wipe any water or stains right away to preserve the finish as much as possible.