What detergent for a Karcher window washer?

[lifeofsiam]

We have inherited one. I know Karcher do their own liquid, but if you have one, do you get decent results with anything else? Dh just tried with glass cleaner and it's quite smeary.

[ginghamstarfish]

I use a drop of washing-up liquid and a dash of white vinegar in water, wash windows with this and microfibre cloth (or use long-handled mop), then hoover up liquid with the Karcher. May need to wipe round edges, sills with dry cloth afterwards. Wash out the Karcher reservoir bottle.

[stripeyzebra32]

You only get a small bottle of the solution with them so we find hot water with a tiny drop of washing up liquid leaves the Windows pretty clean.

[lifeofsiam]

Thank you both

[weirdobeach]

We use Karchers own detergent liquid and it's great. Our windows come out looking spotless without any smears.