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The 3M also has a clearcoat finish applied to it, so you can wax it etc. The Ventureshield does not and the recommendation is not to wax it unless you're using stuff like Zaino or equivalent. For Ventureshield, the recommended cleaner is a plastic cleaner.
The Ventureshield is 3 layers and the top layer is clearcoat. I've been using wax on it since new (Almost 4 years old).