Quick answer: Machine-wash robot cleaner pads at 30–40°C with normal detergent and no fabric softener — softener coats microfibre and permanently kills its grab. Air-dry, never tumble-dry hot. Wash after every 2–3 cleans, and replace pads when they've greyed, flattened or lost their velcro grip — as a rule of thumb every 3–6 months of regular use. A streaking robot is nearly always a tired pad, not a tired robot.
Microfibre pads are the entire business end of a robot window cleaner: the machine supplies grip and coverage, but the fibres do the actual cleaning. Which means pad condition is the single biggest variable in your results — and the first thing to check when a robot that used to leave glass perfect starts leaving haze.
Why microfibre works (and how it dies)
Each microfibre strand is split into wedge-shaped filaments finer than a human hair — millions of tiny edges that scrape, lift and hold grime rather than pushing it around. That's the magic. It dies in three ways: the wedges clog with old grease (washable), the fibres flatten with wear (not washable), or — the silent killer — fabric softener wraps every filament in a waxy coat and turns your precision tool into a smeary rag in one wash cycle.
Washing them right
- Temperature: 30–40°C. Hot washes melt the fibre structure over time.
- Detergent: normal liquid or powder, modest dose.
- Fabric softener: never. Also skip dryer sheets. If pads have been softened by accident, several hot rinses can partially revive them, but the grab never fully returns.
- Company: wash pads with lint-free items or alone — they harvest lint from towels, and lint ends up on your glass.
- Drying: air-dry, or tumble on cool. High heat fuses the split fibres.
Frequency: after every two or three cleans indoors — after every single session on traffic-film glass, salty coastal panes or rooftop solar panels — those loads are exactly what clogs fibres fastest.
When washing stops working: replace
Retire a pad when any of these show up:
- Permanent greying that survives a wash — the fibres are clogged with bonded oils.
- Flat, shiny pile — the wedges are worn round; it polishes instead of grabbing.
- Weak velcro grip — a pad that shifts mid-clean smears and can foul the seal.
- Any embedded grit you can feel — one trapped particle is a scratch generator.
For regular weekly-ish use, that's typically every 3–6 months. At £27 for a 6-pack of CleanBot R1 pads, fresh fibre costs about a pound a month — the cheapest performance upgrade in home cleaning. (Running an Ecovacs Winbot? Your pad guide is here.)
The two-pad rotation (the pro habit)
Keep two pads in service: one on the robot, one clean and dry. Swap between sessions — a genuinely dry pad matters because damp-stored microfibre goes musty and transfers the smell to your glass. With six pads, you'll always have a fresh one for the finish pass on the glass guests actually look through.
FAQ
My robot suddenly streaks — new pads or new robot?
Pad, almost always. Fit a fresh one and re-test before diagnosing anything else. Second suspect: too much or the wrong solution.
Can I use generic microfibre cloths instead?
Only pads cut for your robot: thickness affects the suction seal, and loose cloth edges can catch the drive mechanism. This is one place to be boring and buy the right part.
Wet or dry pad for daily touch-ups?
Dry for dust and polish, lightly misted for film. Never soaked — damp-not-wet is the rule.
Fresh pads, right solution, and the CleanBot R1 stays at day-one performance for years. Stock up on pads here.