My 2000-era house has whatever builder-grade hardwood floor. When I use murphys oil soap and scrub off all the residue that the Toddler Army tend to leave, I find that it's in decent shape but it's not shiny at all. I feel like once its clean, I should finish with some kind of wax or protective finish. I heard that shopping mall floors last literally forever because they wax them, and the wax is the only thing that wears. It's a good theory. So what do people suggest?