Having terrible trouble with a streaky screen, I changed the wiper blades for a second time in a month after first sourcing MER windscreen cleaner and applying as per instructions. Both were a waste of time and money. Several further daily attempts to remove the film using MER were also unsuccessful. Based on this experience, I declined to act upon the alternative advice given to use Autogylm windscreen cleaner and, in desperation, raided through the contents of the cupboard under the kitchen sink where I found ‘Cif’. To my delight and relief, it worked a treat. I obviously ensured that, after application and wiping clean, I fully rinsed the windscreen with ample tap water using a watering can.