u/Background_Two6903

Recently purchased this beautiful frame from an antique fair but it’s quite dirty. I was able to remove the framing tacks on the back and clean the glass- but have no idea how to tackle cleaning the wooden frame itself. It looks like it could be a different color underneath? Or is this just the color it is? I did already go around it lightly with a damp towel and brushed off some dirt with an old toothbrush. Not sure what to do next -any tips are helpful!