Either you leave the clog as it is and start using it immediately without protective treatment. Then the leather will become flamboyant from stains and the wood possibly a little more sensitive to dirt, but you can romantically call that "patina" and not worry about it any more. But for a shoe that keeps its style better over time, you can treat it before use. Lubricate the leather with wax, tallow or oil. This makes it more dirt-resistant and possible stains can be wiped off immediately. Note that it will cause the leather to darken immediately but it is a process that will happen over time anyway. We like wax and sebum the best, don't really have an explanation as to why. If you don't have anything like that at home, it works great with regular olive oil. The wood in the sole is preferably protected with an uncolored wax, e.g. linoleum wax or beeswax, but the olive oil principle also applies here. Hard wax oil, which you may have left over after a floor treatment, also works. Note! Always test on the underside first to see if you like the result.