Direct answer. Four consumables cover the overwhelming majority of after-sales work on a window cleaning robot: microfibre pads, spray nozzles, suction seals and battery packs. Most reports of “the pump has failed” turn out to be a contaminated seal or a partly blocked nozzle, so the cheap parts matter more than the expensive one. There is no cloud account and no subscription involved — the failure modes are mechanical and diagnosable, which is what keeps the support burden bench-fixable. A distributor who stocks those four parts resolves most tickets without an RMA.
Why the support burden here is lower than it looks
A window cleaning robot has no app-dependent core function. Nothing about the cleaning cycle is switched off by a vendor, and nothing stops working because a server did. That changes the shape of after-sales work.
What comes back is physical. A pad that has been run over dusty glass. A nozzle that has been ignored until it clogs. A seal that is sitting on grit. A pack that was stored flat and empty for a season. Each of those is a part, and each of them can sit on a shelf in a distributor’s warehouse.
This is the part of the category that gets undersold. Buyers compare suction and unit price; the number that decides whether the category is profitable in year two is the return rate.
The four consumables, and what each one fixes
| Consumable | Symptom it clears | What the operator should already be doing |
|---|---|---|
| Microfibre pads | Streaking, a fine grey film that shows in low sun, scratches on coated glass | Wash after every working day — a pad loaded with grit scratches coated glass |
| Spray nozzles | Uneven or thinning spray, water spotting, dry patches near the edges | Rinse the tank and let it dry before refilling |
| Suction seals | Weakening hold, longer cycle times, drop-detection warnings | Wipe the seal, drive tracks and drop sensors with a damp cloth |
| Battery packs | Shorter runtime, reduced UPS hold, loss of storage capacity | Charge to storage level rather than full, and never store a flat pack for months |
Read the third column as a sales tool, not a manual. Those maintenance habits are also the reason a distributor’s ticket volume stays low, and they belong in the launch training you give a new channel. A reseller who understands why the pads get washed daily will not generate the returns that make a category look unprofitable.
The five ways these units actually get damaged
Most of these are operator habits rather than manufacturing defects.
- Running the unit dry over dusty glass. Grinds grit into the pads and the suction seal.
- Leaving a powered-off unit stuck to a pane. Nothing is holding the vacuum at that point.
- Using an abrasive or strongly acidic cleaner on coated, low-e or tinted glass instead of the spray system and water.
- Ignoring a slowing spray until the nozzle clogs solid.
- Storing the battery pack flat and empty for months, which shortens lithium life faster than any other habit.
A unit that gets clean pads, a rinsed tank and a charged pack will outlast one that is run hard and put away wet. That sentence works in a product listing as well as in an after-sales script, because it moves the conversation from “the product failed” to “the product was not maintained”.
How to vet a window cleaning robot supplier on spare parts
This is where most importers learn the difference between a supplier and a trading desk. Ask three questions before the first order, not after it.
Do the spare parts come from the same production line as the units? A supplier who buys finished goods cannot guarantee that a pad or a seal spec will stay constant between shipments. That matters commercially: consumables are where your repeat-purchase revenue sits, and inconsistent parts turn a repeat customer into a support case.
What is the spare-parts ratio, and is it in writing? The answer belongs in the purchase agreement, not in a chat message. Agree the proportion of units supplied as warranty spares and how they ship.
Can you name the exact configuration? A certificate, a spare or a firmware version issued for a sibling model with a different body or battery does not cover the unit you are shipping. Our own range publishes the certificate set model by model for exactly this reason.
Writing spare-parts terms into the purchase agreement
Unclear agreements cause more sourcing failures in this category than bad products do. Three clauses prevent most of it.
- Defect-rate threshold. State the acceptable defect rate per shipment and the remedy if it is exceeded.
- Warranty spare-parts ratio. Agree what proportion of units ships as warranty spares, and how.
- Inspection criteria. Define what gets inspected, at which stage, and against which standard.
The same agreement should carry the anti-fall specification if you sell into commercial or tender channels — that clause is covered in UPS hold vs triple anti-drop, and it follows the same logic: write it down, or you do not have a specification.
When we would tell you not to stock spares yet
- You have not validated sell-through. Spares are inventory like any other. Validate the model mix first, because the right spare ratio depends on which models actually move in your channel.
- You are single-model at low volume. One model at low volume is usually served by ordering spares alongside the next unit rather than holding a dedicated shelf.
- Your market is project-based rather than repeat-purchase. Tender and facility projects buy spares as part of a service commitment, so the spare commitment belongs in the project agreement instead of in your warehouse.
FAQ
Which consumable should a new distributor stock first?
Microfibre pads. They are the highest-frequency replacement, the cheapest to hold, and the part whose condition most affects how the end customer judges the product. Nozzles and seals come next.
Does weak suction mean the pump has failed?
Usually not. The common causes are a contaminated suction seal or a partly blocked nozzle. Diagnose those two before replacing a pump, or you will replace the expensive part and leave the actual cause in place.
Do these units need a cloud account or a subscription?
No. Some models support app control and scheduling — the X9 pairs app control with a patented dual water spray and a 70 ml tank — but the core cleaning function does not depend on a service. That is what keeps the support work mechanical and fixable at the bench.
How many pads should a distributor hold per unit sold?
There is no universal ratio, and any supplier quoting one should be treated with caution. It depends on how often the channel’s end customers actually clean. Measure it across your first reorder cycle rather than setting it up front.
Ask us for the consumable and spare-parts list for the models you plan to stock, including which parts we hold for immediate reorder. Contact us →