If you plan to keep it for yourself, and it bugs you, then I'd say clean it, but I don't know any tips for having it look even in the end.

However, if you plan on selling in the near future, I'd definitely leave it alone, as it will be harder to sell once cleaned (especially if the K logos get cleaned off). Most drummers don't care about a few tarnish spots, and prefer the uncleaned look.

I'd leave it alone. To my way of thinking, cleaning a K kind of negates the whole point of having a K. Let it get darker and improve with age.

Let us know how you like them.