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I found my pot of it last week and applied it, and couldn'e think why I hadn't for some time, as the water beads straight off the windscreen when it's raining. You hardly need your wipers !!!
Zymol HD Cleanse produces a similar performance to Rain X although it won't make your wipers skip. HD Cleanse is not just an awesome paint cleaner, it is by far the best window cleaning product out there...
A lot (~£30), but Werkstatt Prime Strong is another good bet for £15 that doubles up as an excellent metal sealant and basecoat for alloy wheel protecton.