Loking for an expert advice



There are big windows in my new office with small scratches on them. I want to buy a window cleaning robot. 

1) I don't know which one to choose. These are my variants https://www.bestadvisers.co.uk/window-cleaning-robot, but I open to any other suggestions ;)

2) Can I use a robot, when I have scratches on the windows? Won't it make situation worth? 

Thank you for your time and ideas!

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