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We live in the great Northeast. Neighbors have put up systems as long as five years ago. (I'm waiting for the new Solar City collectors which are way more efficient.) I check one neighbor's collectors on the way to the P.O. every day. They look dang clean to me.

We also have a natural set of cleaners...wind and rain. There are already self-aligning collectors, but the payback on them is not significant enough to make them worthwhile.