Quick answer: A sliding door is three jobs pretending to be one. Glass: vinegar solution and a microfibre or squeegee, top-down, both faces — or a robot, since door panes are the biggest uninterrupted glass in most homes. Track: vacuum the grit out first, then scrub with soapy water and an old toothbrush, dry, and lubricate with silicone spray, never oil — oil glues the next month's grit into a grinding paste. Rollers: run them along a silicone-sprayed track and adjust height if the door still drags. Do the track quarterly and the door will glide for decades.
Sliding doors are the hardest-working glass in the house: touched daily, licked by dogs, rained on, slammed, and running on a track that doubles as a grit museum. Most people clean the glass and ignore the machinery — then wonder why the door needs a shoulder to open.
Job 1: the track (do this first, or regret it)
Vacuum before anything gets wet. Crevice tool along the full track, both channels; wet grit turns to mud and packs into the roller path. Then hot soapy water and an old toothbrush along the channel, a cloth wrapped over a flat screwdriver for the corners, rinse, and — non-negotiable — dry it fully before lubricating.
Lubricant: silicone spray only. WD-40 and oils feel great for a week, then bind dust into an abrasive paste that chews rollers. Dry silicone (or PTFE) lubricates without stickiness. One pass along the rail, slide the door a dozen times, wipe the excess.
Job 2: the glass (the part a robot owns)
Door panes collect hand grease at handle height, dog nose art along the bottom (the dogs-and-kids survival guide is here), and rain spotting outside. Hand method: 1:4 vinegar solution, wash top-down, squeegee in overlapping strokes, dry the edges.
But note what a sliding door actually is: the largest flat, framed, ground-level pane you own — the single easiest glass in the house to automate. A CleanBot R1 maps a full door panel in minutes per face, gets the top corners you stretch for, and turns "do the doors" from a 40-minute chore into "place robot, make tea". Households that clean doors weekly because of pets and kids feel this one immediately.
Job 3: rollers and alignment
If the door still drags on a clean, silicone-slick track, the rollers are worn or sitting low. Most sliding doors have adjustment screws in the bottom edge (behind small caps): quarter-turn clockwise usually raises the door — adjust, test, repeat. A door that needs force is also a door that slams, and slamming is what eventually cracks glass and breaks locks. Five minutes with a screwdriver protects the whole assembly.
The weekly 90-second routine
Robot (or quick vinegar wipe) on the glass inside face, dry cloth over the handle zone, and a glance at the track. That's it — the deep clean above is quarterly. Little and often beats heroic and rare on every glass surface in the house; the full cleaning-rhythm guide is here.
FAQ
Why does my door glass streak worse than my windows?
Hand and pet grease respond differently to cleaners than dust film — degrease first (a drop of washing-up liquid in warm water), then the vinegar pass. Streak chemistry explained here.
Can the robot clean the outside face too?
Yes — it's ground-level glass, so placement is trivial. Slide the door open, place, anchor the rope, done. Both faces in under 15 minutes, unattended.
My track has standing water after rain — problem?
Check the weep holes at the track's outer edge; they're probably blocked with the grit you're about to vacuum out. Standing water in tracks ends up as failed unit seals — clear them.
Glass, track, rollers: an afternoon once, then minutes per month — with the robot handling the biggest part entirely on its own.