If that wasn’t enough, we’ve solved the problem of accidental spills by redesigning our screen wash bottles. No more sloshing screen wash all over the engine bay or having to use a funnel; simply pour and go for unrivalled visibility and cleaning power out on the road. How it Works

Unless your classic is very old, you’ll need to make sure there is some fluid available when you press the button to wash the windscreen. In winter it will help get rid of road grime and salt, in summer it helps clear fly splats, dust and diesel film. For winter driving, we recommend a 50:50 mix of screen wash and water; this ensures maximum freeze protection. In summer, you can reduce the amount of screen wash you use; a 30:70 split is best. The instructions recommend it is used at the ‘optimum clean’ dilution ratio of 1:9, which stops freezing down to a claimed -3 oC. Prestone has developed products to keep you driving all year round. This unique Screen Wash works to achieve max visibility to ensure safer driving throughout Autumn and Winter.In summer this makes it seem good value compared to some ready-mix rivals, but the advantage disappears in winter. We tried it at the suggested level for protection down to -22C and it was fine and fluid after several hours in the freezer, but at that mix ratio it would make little more than half a litre. In fact, the instructions only suggest diluting it by up to a factor of 3:1, which means one bottle would only make a litre of fluid. Since the average washer reservoir is three to four litres, that’s going to be expensive. The Halfords wash gave the best cleaning performance and excellent freeze resistance at a reasonable price so takes the win here, but we’d recommend buying the ready mix rather than the concentrate as – bizarrely – it’s better value.

The screenwash is new and improved, using a streak free formula to keep your windscreen clean and clear. The bottle of Wynns is the smallest here, yet it claims to be ‘Super Concentrated’ and offer protection down to -70C. In reality though, that headline figure of -70C is only if you use the Wynns neat, which is unlikely to be necessary in the UK. First we calculated the costs of each in their winter and summer mixes. For the former we chose coverage down to about -10C, where there was a choice of mixes. At a summer mix rate of 4:1 the Halfords wash cleared both the glue and the oil after a few wipes, giving the best cleaning performance in the test. Autoglym Ultimate Screenwash 500ml Powering through dirt, grime, and smears, Prestone Extreme Performance Screen Wash is the only product you’ll ever need to keep your windscreen clean and clear.

\r\n\t\t\tHalfords -10 Ready To Use Berry Screenwash 5L

Eco Refill doesn’t compromise on cleaning performance. This is the same Prestone screen wash you’re used to, but now in a super-concentrated formula. Tough on dirt, streaks and grime, it’ll make light work of whatever winter sends your way. Lift the bonnet and locate the screen wash reservoir cap; it’s typically blue with a windscreen icon on the top. Flip open the cap, hold the lid out of the way, and begin pouring. Prestone Extreme Performance Screen Wash ensures maximum cleaning power to remove stubborn dirt from your windscreen. It also helps you drive in extreme conditions all year round, by melting ice down to -18ᵒC and preventing dangerous sun dazzle. Prestone lab tests simulate seasonal driving experiences, but real life tests are conducted on the road in extreme conditions. Prestone works in any weather to keep your windscreen clean for safer driving.”