Rain-X Weatherbeater
Price: £6.99
Used in isolation, Weatherbeater is likely to impress. It combines a glass cleaner and Rain-X repellent, and clearly leaves a coating on the glass. Plus, it’s just as easy to use as a conventional cleaner. It beads water well, but does so nowhere near as quickly as the standard repellents. And by the end of our four weeks, it had begun to fade.