How to Clean and Maintain a Robot Vacuum

A robot vacuum isn't a one-off purchase — filters, brushes and mop pads all wear out, and neglecting them is the #1 reason robot vacuums lose suction or start smelling bad. Here's the maintenance schedule that actually matters.

Weekly: empty the dustbin and wipe sensors

If your model doesn't have a self-emptying dock, empty the dustbin weekly at minimum — a full bin reduces suction noticeably before it looks "full" to the eye. While you're there, wipe down the cliff sensors (small sensors on the underside that stop it falling down stairs) with a dry cloth, since dust buildup on these can cause a robot vacuum to behave erratically or refuse to dock.

Every 1-2 months: clean or replace the filter

HEPA filters trap fine dust and pet hair and clog faster than people expect — Roborock's own guidance recommends replacing the HEPA filter roughly every two months, or after around 150 hours of runtime, whichever comes first. A clogged filter is one of the most common causes of a robot vacuum that seems to have "lost power" even though the motor is fine.

Every 1-3 months: clean the mop pads (if applicable)

On combo vacuum-mop models, wash or replace mop pads every one to three months depending on how often you run mopping cycles. Many current-generation robots (including Roborock's washing dock models) self-wash pads after each run, but the pads themselves still wear out and need periodic replacement — a stiff, worn pad drags dirt around instead of lifting it.

Every 6-12 months: replace the main brush

The main roller brush picks up hair and thread that wraps tightly around the bristles over time — even brands with "anti-tangle" comb designs (most current Roborock, Ecovacs and Dreame models) still need the brush cleared of trapped hair regularly and swapped out roughly every 6-12 months as bristles wear down and lose their sweeping efficiency.

As needed: side brushes and sensors

Side brushes (the spinning arms that sweep debris from wall edges into the main path) should be replaced when you notice bent, missing, or badly worn bristles — usually every few months in a busy household. Also periodically wipe the front-facing camera or LiDAR sensor lens on mapping robot vacuums, since a dusty lens degrades navigation accuracy over time.

What replacement parts actually cost

Official OEM replacement parts (filters, brushes, mop pads) from brands like Roborock and Ecovacs typically run in the $20-$60 range per item depending on the part and model, available through their NZ online stores and stockists like PB Tech and JB Hi-Fi. Third-party compatible parts sold on marketplaces are commonly 40-60% cheaper than OEM, and work fine for filters and brushes in most cases — just be more cautious with battery replacements, where quality control varies more and a poor-fit battery can affect charging safety.

Don't skip: the dock itself

If your model has a self-emptying or self-washing dock, the dock's own dust bag or water tanks need periodic attention too — dust bags typically last 4-8 weeks before needing replacement, and clean water tanks need refilling and dirty water tanks need emptying regularly on mopping docks, or you'll notice a musty smell developing.