Cleaning the inside of a tall window

I use one of those floor mops with the microfibre fluffy cleaning cover to reach high surfaces. I use them dry to de-cobweb ceilings and high walls too. Can't remember what they're called but there are loads of different ones. I bought quite a narrow, light one.

A cleaning device with a long or telescopic handle.

Get a window cleaner to come in and do it, or anyone else, just don’t do it yourself please.