Originally Posted by Mainecoonmaniac
I see screws in the shot. Possibly remove the the track and soak it in some mineral spirits? Keep in mind that you'll have to get the front and rear standards off first.
Yes, if the track is easy to remove, go at it with a toothbrush and mineral spirits. Clean the pinions the same way if possible. Try one of the dry bicycle chain lubes, they attract far less crud.