It comes with two interchangeable squeegee heads, which can be detached from the suction nozzle for cleaning after use. These heads measure in at 18cm and 28cm. Both feature the new lip technology to allow for upper-edge cleaning to the ground without interruption, to achieve a streak-free finish. I have to say I was impressed by the results. Surprisingly, I didn't have to repeatably go over the area with the spray bottle, and the squeegee blade wiped away all of the diluted concentrated cleaning liquid to reveal a shiny surface – with no water marks to be seen. There are several accessories available for the Karcher window vac including replacement pads, belt holders, cleaning liquid and extra battery chargers.

Having added the cleaning concentrate to the spray bottle with 150ml of water, my first cleaning job with the Karcher Window Vac WV 6 Premium was the three- window bay in my front room. I sprayed the cleaning solution on the harder-to-reach areas of the shower screen first, then turned on the window vac. I moved in a vertical direction and could see the buildup (almost) vanish. This was a great result. We would like to point out that lowe have stumbled upon some forum posts that seem to highlight that the Karcher Vac does seem to have a vulnerability when it comes to the battery. People have mentioned that after only a few months the battery life has significantly decreased. While we can’t vouch for that as that hasn’t been our experience the battery on the WV2 is not interchangeable. Therefore, if you are worried about this potential problem then maybe the WV5 premium with the interchangeable batteries might be the better option for you. We recommend you follow the manufacturer’s instructions to help protect and prolong the battery life of your window vac. Karcher Window Vac AccessoriesWeight and capacity: A kilo may not feel like much at first, but after half an hour of holding the unit at arm’s length it will start to hurt – especially when it fills up with 300ml or so of dirty water. The bigger the tank, the more cleaning you can do without having to stop and empty it, but the heavier it will get. So, tank size is less important than leak-proofing and easy emptying. What extra features and accessories are worth having? You use a separate spray bottle with window cleaner concentrate to help lift the dirt from the surface. While not exactly groundbreaking, a microfibre cleaning cloth head can be attached just above the spray nozzle to wipe over the spray when triggered. Ensure that the trigger is securely fixed to the bottle to avoid any leaks. Read next: 10 best mould removers that actually work Does the Kärcher WV Classic window vac offer value for money?

Suction power is excellent and you get oodles of extras in the box, including a smaller head and microfibre attachment. However, what pushes the Bosch behind the Karcher and Vileda in our list is its failure, reported by some users, to clean quite as well to the very edges of your windows. The set consist of 2 extending poles; one for the window vac and a separate one that has a washable cleaning head attachment. Each pole is 1.2 metres in length but can be extended to 1.9 metres. Your Karcher window vac can be securely mounted on the base plate and attached with the rubber strap. The spray tool is very easy to use and the vac did a good job of cleaning up the dirty water first time. We only had to re-do a few small areas. We only used washing up liquid in the cleaning bottle but overall the windows looked clean and streak-free when we’d finished. We must mention that there was some stubborn bird poo on the window and we had to redo this area. We feel that if your windows are extremely dirty then some preparation might be needed beforehand to ensure the vac is as efficient as possible.I also have a Karcher window vac. It's brilliant for clearing condensation and also for cleaning the windows.” Rated by Mumsnet user Clarice99 Our verdict So, what can the window vac be used for? Well obviously, the main use is for cleaning windows but in our experience, it can also be used for cleaning shower doors and removing condensation from surfaces. The window vac is extremely versatile and we found it particularly useful for cleaning up liquid spills but you may find it handy for other applications. In fact, it will perform great on all smooth surfaces. What’s in the box? We select top-selling window vacs from leading UK retailers and put them through a string of tough tests to find out which are the best. The best window vacs you can buy in 2023 1. Karcher Window Vac WV5: Best all-round window vacuum cleaner

Interchangeable suction heads: Most window vacs come with a 280mm suction head as standard, but many include an additional smaller head for fiddly jobs such as leaded windows and front door panels. Pivoting suction heads can also help to get into awkward spots. Laura started writing Swears By articles for Mumsnet in 2021 and has recently taken over responsibility for laundry content. She writes buyers guides, cleaning articles and tests products, to help Mumsnetters make informed choices when it comes to parting with their pennies. We judge how comfortable each window vac is to hold and empty. We also do this wearing Cambridge Simulation Gloves – a piece of kit that helps replicate the experience of users who suffer with limited hand movement. Karcher has a strategy of offering “basic” products alongside “premium” versions with extra (admittedly useful) accessories; this is common with their pressure washer range as well as their window vac range. It can sometimes be frustrating to choose which is better because it’s the tools and attachments that are useful to us and not really the base unit.None of that would matter if the Karcher didn’t clean windows brilliantly – and that’s where it really excels. Suction is strong and efficient right across the nozzle, so you can clean and dry into the silicone seal around your windows. The finish is about as streak-free as a window vac can achieve, although you may want to give your glass a final buff with a dry kitchen towel. The WV2 Plus and WV5 Premium models are pretty much the same base unit, the only difference being that the WV5 has a removable rechargeable lithium-ion battery for even extra run time. The WV1 uses the older, bulkier and heavier, base unit.The difference is mainly in the accessories you are supplied. We recommend that you avoid the WV1 model as it only comes with a standard wide nozzle and has no cleaning tool (plus it’s the old base unit). The best bet is to go with the WV2. Reviewer Mel lives in a three-bedroom house in Sussex with her husband, two teenagers, three cats, three degus, two tortoises and a hamster called Winnie. Image credit: Future / Jennifer Oksien) Karcher Window Vac WV 6 Premium review: price and availability Mel uses her Kärcher on 11 panes of glass every morning during the winter months. She says that not only does this save time (as well as her paintwork), it also means that she is not going through tea towels at a rate of knots. “I was getting through three or four tea towels each time, wiping the water up and then wringing them out,” she said. “I fill up the reservoir on the Kärcher twice while doing the windows. It's amazing actually how much water you get. "It saves me hours."