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I use a pinlock, which is brilliant, but will be ordering some of this Clarity Defogit tonight, to see how well it works, as the prices of pinlocks keep going up.

For the outside, Nikwax Visor Proof does the job, but as already covered here, it needs very regular applications with the current road conditions.

I've tried Rain·x to compare the difference, but saw no noticeable difference in performance, just ease of application. Rain·x is not recommended for plastics as IIRC, it can cause some plastics to become brittle.