There are vacuum cleaners for just about every cleaning job - floors, cars, wet spills - but a vacuum cleaner for windows? Karcher claims the battery-powered WV 70 plus cleans windows perfectly in no time at all, without any streaks. 'No time at all' may be a little optimistic, but from our testing it does leave a streak-free finish.

How does it work?

You first spray the window with the detergent/water mix and wipe it with the microfibre pad to remove most of the grime, then immediately vacuum the dirty water residue from the glass with the window vac. The result is a clean, dry, streak-free window.

Does it work?

Our tester tried the Karcher WV 70 plus out on windows (inside and outside surfaces), mirrors and bathroom wall tiles. He found it easy to use and was able to get a nice, streak-free finish. Since outside window surfaces are often fairly dirty, you might want to give them an initial clean with a hose or cloth to avoid clogging the microfibre pad with too much dirt.

Is it worth the money?

The Karcher retails for $149, so obviously there are much cheaper window-cleaning options out there such as microfibre cloths and glass-cleaning sprays, but the vac could save you time and effort if you have a lot of windows or wall tiles and like to keep them clean.

What's included?

The WV 70 plus set includes the window vac itself with squeegee attachment (280mm wide; a 170mm attachment can be bought separately for use on smaller areas), plus a spray bottle with a microfibre pad attachment, detergent concentrate, and recharger.

Extra detergent sachets can be bought, though regular detergents from the supermarket will probably work just as well. Glass that's not too dirty can be cleaned with detergent-free water (tap water is fine).

The WV 70 plus has a 3.6V lithium battery and runs for 20 minutes on a full charge. Charging takes two hours.