Good but not brilliant,
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This review is from: Karcher WV50 Window Cleaning Vacuum and Spray Bottle (DIY & Tools)
It is great for heavily condensed conservatory windows but not for the lower part as the vacuum can only work if held vertically; to do the bottom of the windows you have to tilt the machine and it then isn't effective. It is not possible to dry the ceiling windows of the conservatory as the vacuum cannot take in the water and it is sprayed out through the machine's vents.