Clean the Track
Step 1
Open the door all the way to expose to the track.
Step 2
Remove obvious impediments to the door's movement such as dirt, pebbles and other debris.
Step 3
Apply a generous coating of denatured alcohol to the length of the track.
Step 4
Let the alcohol sit for a moment to loosen the grime.
Step 5
Wipe the grime out using paper towels.
Step 6
Repeat this process until the track is clean.
Step 7
Spray a coat of WD-40 or another lubricant along the length of the track.
Clean or Replace the Rollers
Step 1
Remove the head stop screws that secure the door in the top track.
Step 2
Adjust the roller adjustment screws at the bottom of the door to retract the rollers.
Step 3
Lift the door into the top track so that the bottom of the door clears the bottom track.
Step 4
Work with a partner to inch the bottom edge of the door toward the outside. Lower the door and remove it. Lay the door on a padded surface or set it across two sawhorses.
Step 5
Remove the roller adjustment screws. Pry the rollers out with a screwdriver. Inspect the rollers. If they appear worn or damaged, replace them. Otherwise, clean and lubricate them.
Step 6
Remove debris that might impede the rollers' movement. Clean the rollers with denatured alcohol using paper towels. Lubricate the wheels by spraying them with WD-40.
Step 7
Replace the rollers with the clean originals or with a new set.