The grease trap on my 15 year old Jenn air is clogged. The grease from cooking steaks stays in the bottom of the pan and doesn't go into the cup beside the oven. I ran the oven on a clean cycle thinking it would get the entire stove warm enough to unclog the lines. Although the grease in the cooktop turned to liquid, it never did flow down into the cup. Is there anything I can put down the lines, or am I going to need to replace the line to get it working again?