I use Hygieia window cleaning service, because I've had several different cleaners and none have been as reliable and professional as Hygieia, Mark sends me a text the day before he is coming to clean the windows, I have him clean the windows every 6 weeks, he's never let me down, he takes into account the state of the weather, if its too bad, rain etc, he'll text to say he'll leave it until its better weather, so, all in all I can not recommend them highly enough, they have serviced my windows and conservatory for the past 6 years without a problem, they always do a great job.