I've seen window washers clean the windows of my company, and it looks so dangerous to wash and wipe windows over 10 stories high! They're hanging in mid air through a rope, while it may be exhilarating, it seems that even one accident is a little too likely. So seeing these robots come in to do this kind of job is pretty cool, although the battery life seems to limit it to residential use rather than commercial. But it would be nice to have robot wipers wiping my windows! They just need to be able to charge themselves, maybe have a little 'robot nest' in my roof somewhere and it'd be perfect!
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Thank you for your opinion, best choice :)