Quick answer
To clear condensation off windows every morning before it soaks into sills and grows mould, a cordless window vac with at least 30 minutes of battery is the quickest tool, and the Kärcher WV 6 Plus is our pick: an Amazon's Choice rated 4.4 stars across 4,601 Amazon.co.uk ratings, with a 100-minute battery and a 280 mm nozzle for large panes. For a flat with a few windows, the Kärcher WV 5 Plus is lighter on the budget. A window vac removes water, not the cause.
Single-glazed and older double-glazed windows run with water on cold mornings, and that water drips onto sills and seals where black mould grows. A window vac sucks it off in seconds and collects it in a small tank, which is far faster than wiping with towels that then need drying. It is a daily tool for the symptom; ventilation and a dehumidifier deal with the cause. These four picks were read on Amazon.co.uk on 15 October 2026.
Our picks
Pick 1 · Best overall, Amazon's Choice
Kärcher WV 6 Plus Cordless Window Vac
Best for: Houses with many windows or large patio doors.
Check price on Amazon.co.ukA 100-minute battery means you can clear every window in a house each morning for days before charging. The 280 mm nozzle covers a standard pane in one or two strokes, and the battery display stops it dying halfway through. For condensation work, skip the spray bottle; just pull the vac down each pane from the top, empty the tank into the sink and wipe the sills. Do this before opening curtains, which otherwise trap the moisture against the glass.
Pros
- Longest battery on this page
- Wide nozzle clears big panes in one pass
- Shows remaining charge
Cons
- Heavier than smaller models
- More than you need for two or three windows
Key specs (from the listing)
- Battery:
- Up to 100 minutes
- Nozzle:
- 280 mm
- Battery display:
- LED indicator
- Included:
- Spray bottle, microfibre cloth, 20 ml cleaner concentrate
Pick 2 · Best for flats
Kärcher WV 5 Plus Cordless Window Vac
Best for: Flats and smaller homes with a handful of windows.
Check price on Amazon.co.ukIf you have five or six windows, 35 minutes of battery is plenty and the WV 5 Plus is the more sensible buy. Use it on the shower screen and tiles after a shower as well, which cuts the moisture that feeds bathroom mould. The listing is light on detail beyond the battery time and the promise of no drips, so if nozzle width matters to you, check the product images before ordering.
Pros
- Same Kärcher build and suction design
- 35 minutes covers a typical flat
- Also clears shower tiles and mirrors
Cons
- Shorter battery than the WV 6
- Listing gives few other specs
Key specs (from the listing)
- Battery:
- Up to 35 minutes
- Use:
- Windows, mirrors and tiles
- Result:
- Removes moisture without drips or streaks (listing)
Pick 3 · Most-rated model
Kärcher WV2 Premium Window Vac, Black Edition
Best for: Small panes, leaded lights and narrow window frames.
Check price on Amazon.co.ukThe WV2 is the window vac that made the category popular in the UK, and this edition adds a narrow nozzle that fits small cottage panes and the gap above a window handle. Battery life matches the WV 5 at 35 minutes. Buy it if your windows are divided into small panes, where a wide nozzle does not fit.
Pros
- Narrow nozzle for small Georgian or cottage panes
- Long track record with a very large number of buyers
- Complete kit in the box
Cons
- Older design than the WV 5 and WV 6
- Limited edition colour may come and go
Key specs (from the listing)
- Battery:
- 35 minutes
- Nozzles:
- Standard plus narrow suction nozzle
- Included:
- Spray bottle, microfibre cover, 20 ml concentrate, charger
- Surfaces:
- Windows, tiles, mirrors, shower cubicles, glass tables
Pick 4 · Simple, lightweight option
Beldray Cordless Window Vac
Best for: Occasional use or a second vac for a bedroom.
Check price on Amazon.co.ukBeldray sells this as a condensation remover, and it does that job for a bedroom or two. The 60 ml tank fills quickly when windows are streaming, so empty it between rooms. It is a lighter, simpler tool than the Kärcher range, with a lower buyer score. Keep it as a bedroom vac if you already own a larger model for the rest of the house.
Pros
- Light and compact
- Sold specifically for condensation removal
- 30 minutes of use per charge
Cons
- Small 60 ml tank needs emptying more often on very wet mornings
- Fewer accessories than the Kärcher models
Key specs (from the listing)
- Battery:
- Up to 30 minutes
- Tank:
- 60 ml
- Use:
- Windows, mirrors and glass
Buying guide
Why window condensation needs clearing quickly
Water left on glass runs down to the sill and frame overnight and into the morning. Timber sills rot, silicone seals turn black and mould spreads to curtains and the wall reveal. Clearing windows within an hour of waking stops most of that. A window vac collects the water instead of moving it into cloths that then dry back into the room, which is why it works better than wiping.
Battery time and nozzle width
Count your windows. A flat with five or six panes needs about 30 minutes of battery; a house with bay windows and patio doors benefits from the longer run time of a model like the WV 6 Plus. Wide nozzles clear large panes faster, while narrow nozzles reach small panes, leaded lights and frames with handles in the way. Check the tank size too, because heavy condensation fills a small tank after a few windows.
Reduce condensation at the source
A window vac treats the result. To make less water appear, open trickle vents, run extractor fans when cooking and showering, dry washing in a closed room with a dehumidifier, and keep bedroom doors open at night so moisture does not collect in one cold room. A dehumidifier set to 50% usually cuts window condensation sharply within a week.
Who should not buy a window vac
If condensation forms between the two panes of a double-glazed unit, a window vac cannot reach it; the seal has failed and the unit needs replacing. If your windows only mist lightly a few days a year, a microfibre cloth does the job. And if water is coming in around the frame in rain rather than forming on the glass, that is a leak for a window fitter, not condensation.
Questions people ask
Do window vacs work for condensation?
Yes, window vacs are one of the fastest ways to clear condensation. They suck the water off the glass into a tank in seconds and stop it running onto sills and seals. They do not prevent condensation forming again the next night.
Is it better to wipe or vacuum window condensation?
Vacuuming is better. Wiping moves water into cloths that dry back into the room, adding to the humidity. A window vac collects the water so you can pour it down the sink.
Why are my windows so wet in the morning?
Warm, moist air from breathing, cooking, showers and drying clothes hits the cold glass and turns to water overnight. Bedrooms with closed doors and no ventilation are worst. Opening trickle vents and running a dehumidifier reduces it.
Should I wipe condensation off windows every day?
Yes, in winter clear it every morning. Water left on glass reaches the sill and seals, where black mould grows within weeks. A window vac makes the daily job take a couple of minutes.
Can you use a window vac on shower tiles?
Yes. Kärcher lists tiles, mirrors and shower cubicles as suitable surfaces. Clearing the shower after use removes water that would otherwise evaporate into the bathroom or sit in the grout.