Hi. My 6 year old spent much of the long Wisconsin winter running off excess energy throughout the house. This often led to his flopping around on our dining room wood floor and doing sort of a break dance. Hard to describe but suffice to say that he often was rubbing/sliding his hands and feet against the floor. We have noticed that this has left dull marks on the otherwise shiny light wood. Murphy's oil soap has not helped to remove the marks. Any suggestions would be greatly appreciated. Thanks.