Keep Dryer Lint Trap CleanDryer lint traps may appear clean of lint, but still have residue on them from fabric softer. Wash them with a mild dish soap and an old toothbrush to keep the fabric softer buildup off of the trap. The buildup clogs up the screen, much like oil in your skin clogs up your pores. My dryer was throwing an error code to clean the trap. I saw little to no lint, yet after I washed the trap, the dryer started working again. I had no idea how much was built up on it until I compared the side I washed with the side I had not washed yet.