Seems like a good deal, usually £3-£6. I've used a lot of various screenwash over the years and this is up there. What I like most is that it doesn't seem to harm the rubber of the wipers like others have in the past.
The Autoglym Ultimate Screenwash is a highly concentrated formula that can be diluted to suit a range of weather conditions, seasons and screen contaminants.
The 500ml container makes up to 8 Litres of Screenwash and will easily cut through road grime, insect remains and everything else that may end up on your windscreen.
During the winter the dilution can be adjusted to suit falling temperatures whilst maintaining screen cleaning capabilities. If used neat, Ultimate Screenwash remains effective and unfrozen at -45°C!