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Ordinary non-chlorinated brake cleaner. Remove the stock, tape up the optics to protect the glass and spray the crap out of it. Let it sit for a few minutes then spray again. Use a toothbrush to clean the gunk off then spray it off again. Hit it with a blast of compressed air to dry it off then rub a VERY light coating of good gun oil on all metal surfaces. You must re-lube it because the brake cleaner removes all oil from the metal pores and will leave it unprotected. Also, put a tiny film of grease (ordinary auto wheel-bearing grease is fine) on the contact surfaces of the bolt locking lugs.
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