Close the door. Clean out the lower and upper tracks with an old stiff toothbrush . Wipe away the debris with a cloth
Open the door all the way. Scrub the lower and upper tracks with an old stiff toothbrush to remove debris. Wipe out debris with a cloth.
Inspect the track for bent pieces. Replace damaged pieces if needed by removing the door and unscrewing the damaged track.
Apply a greaseless lubricant to the door's rollers according to the manufacturer's instructions. Avoid spraying the track with the lubricant.