Self-cleaning mop docks and hot water washing explained

What happens when the robot docks

When a mopping run ends, or partway through a large room, the robot drives onto a ramp so its mop sits over a washing tray. The dock pumps clean water from its tank into the tray, and the robot spins or rolls the mop against ribs or scrapers to scrub it. A pump then sucks the dirty water into the dirty-water tank.

Many docks repeat this several times during a run, so the mop does not spread kitchen grime into the hallway. Roller mops, such as the Ecovacs T80S Omni's, also rinse themselves continuously while they clean, so they need fewer return trips.

Hot water washing

Some docks heat the wash water. Warm water dissolves grease and dried food better than cold, so the mop comes out cleaner. The Dreame L40s Ultra lists rinsing at 167°F (75°C), the Ecovacs T80S Omni lists warm water washing, and the Roomba Max 705 Combo dock lists heated mopping and roller washing. Shark's ThermaCharged models also heat the wash.

You still fill the clean tank with cold tap water unless the manual says otherwise; the dock does the heating. Hot washing uses more electricity per cycle than a cold rinse, which is worth knowing if you mop daily.

Hot-air drying

A damp mop left in a closed dock can start to smell within a day or two. Warm-air drying blows heated air over the mop after the final wash. The Eufy X10 Pro Omni lists 45°C drying and the Ecovacs T80S Omni lists 140°F (60°C). Higher temperatures dry faster, but any heated drying is a big improvement on none.

Drying typically runs for a few hours after a mopping run, quietly in the background. Most apps let you shorten it or pick a quieter mode.

The other jobs a dock can do

Most mop docks also handle several other tasks. The table lists the common ones and what they save you.

See the best vacuum and mop combos →

What you still have to do

Empty the dirty-water tank after each mopping run or every couple of days, rinse it, and refill the clean tank. Clean the washing tray and its filter weekly, as hair and grit collect there. Change the dust bag when the app asks. See how to empty a robot vacuum.

Use only the maker's detergent, at the stated dose. Other products can foam, block the pumps or void the warranty. Our page on robot mop cleaning solution explains why. Some docks can be plumbed into a water supply and drain, but that usually needs a separate kit and, depending on your home, a plumber.

Note:Docks combine water and mains electricity. Keep them on a level floor, wipe up spills, and unplug before cleaning inside the dock.

Is a washing dock worth the space?

Washing docks are large, often around 40 to 50 cm tall and deep, and need space in front for the robot to drive in. Check the height under shelves or worktops before buying. In return, they make daily mopping practical, which is the main reason to buy a mopping robot at all.

If you have little hard floor, a simpler dock may suit you better; see robot vacuum with or without a mop. If you mop large tiled areas, compare designs in our roller against rotating mop comparison.

Frequently asked questions

Which robot vacuums wash the mop with hot water? Current UK listings with heated washing include the Dreame L40s Ultra, Ecovacs T80S Omni, Roomba Max 705 Combo and Shark's ThermaCharged NeverTouch Pro.

Why does my mop dock smell? Usually the dirty-water tank or washing tray needs emptying and rinsing, or drying is switched off. Clean both and turn drying on.

Can I put hot water in the clean tank? Only if the manual allows it. Most say cold or room-temperature water.

Do I still need to replace mop pads? Yes, every few months as they wear. See our spares schedule.