If the sliding door is still sticky after the tracks have been cleaned use powdered graphite or silicone lubricant to ease things along.
Sliding door moves hard.
Use an aerosol lubricant to lubricate all the door rollers.
Tinker around with the roller screws to see if the door glides better when it s at a lower or higher height.
When there s dirt in the door track it not only makes it hard to open and close the door it may cause serious damage if the door jumps the track when it hits an obstruction.
Sliding doors are very heavy very breakable and very expensive this is a two person job.
Do not use oily lubricants on the track as this can.
This adjustment screw will move the roller height up or down and thus your sliding glass door height will go up or down by as much as 1 4 inch or 1 2 cm.
Never leave the glass door unattended.
Rub a thin layer of dry lubricant to the track.
Then lift the door up and out of the track laying it down carefully across two sawhorses.
First slide open the door completely and remove the head stop.