I'll second The Don's recommedation on the Meguiars NXT - I've had good, long lasting results with that. But never a year. I can't think of anything that's going to last that long. You could probably get away with 3 times a year with that product.

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Jonathan

2011 Mazda2
2000 E320 4Matic Wagon
1994 C280 (retired)