The black trim is porous, and what happened was the wax got inside the pores. To remove, get yourself a simple small detail brush (toothbrush also works) spray some all purpose cleaner (simple green) on the area and scrub lightly with the brush.
The brittles will get inside the recessed area that has the wax. Rubbing it with a rag will do nothing. Once you remove the wax, apply a water based dressing and it will look like new.
Peanut butter also works, honestly. Rub some on, wash it off.
You should use a non-staining synthetic next time, like Zaino
http://zainobros.com . These don't leave wax stains.