First thing I did ; remove all parts, the door, drawer, the back and the keys. Take pictures so you remember how to attach the parts when they are finished. I took an old t-shirt and wax remover to remove the wax layer. After that I used tepentine to remove left over wax or dirt. Then use some sanding paper and sand all the pieces. Remove the sanding dust from the pieces so you can primer the parts.
Sanding the cabinet after removing the wax layer.
The parts on an old news paper and primed.
Sand the primed layer slightly.