As summer arrives with bouts of sunnier weather , you might have noticed that your windows are crying out for a thorough clean . Windows tend to look especially filthy at this time of year, as the sunshine highlights all the grime and rain marks that have built up on the glass during winter. Pollen can also be a major issue, as it's an incredibly sticky substance that deposits a cloudy film on windows and, when mixed with water, forms a dense layer that's tricky to remove, regardless of how