Some solar panel manufacturers and installers will tell you that solar panels don't need to be cleaned but sadly this isn't strictly true, solar panels in Bolton, Greater Manchester and the rest of the UK suffer from the elements just as much as your windows do, more in fact as because of their postition and angle. They are prone to dust, dirt, leaves and bird droppings settling on them and a dirty solar panel will not be as efficient as a clean solar panel. in fact the Solar Energy Power Association states that dirty solar panels can lose 20% of their energy output when dirty, the National Renewable Energy Labaratory puts that figure a little higher at 25% but University Research has shown recently that the figure is closer to 50% loss in output when extremely dirty.
If your panels are already dirty don't worry because UltraPure North West in Bolton, Manchester, Darwen, Wigan can clean them quickly and efficiently using only pure water, lightweight telescopic carbon fibre poles and purpose made soft bristled brushes from the safety of the ground. You could start recouping the small outlay of having solar panel cleaning instantly, because you would regain the output from your solar panels that the dirt causes and you could also save money or gain revenue as well in the long run.
UltraPure North West solar panel cleaners in Bolton recommend having your panels cleaning at least once a year, preferably just before summer so that you can take full advantage of the longer, warmer days throughout the summer months but your solar panels would also benifit from a clean just before winter also as the days are shorter and colder so you really should take advantage of what little sunshine that Purley does get.
http://ultrapurenorthwest.co.uk/cleaning-services/solar-panel-cleaning-in-bolton-lancashire