As simple as it sounds, to clean your lenses, just rinse using only water. Then gently wipe them with a lens-cleaning cloth. Introducing chemical cleaners to your lenses may interfere with the composition of the lens themselves.
Only use approved lens cleaner as a substitute for water. Read any directions carefully for proper care. Sundog cannot recommend any lens cleaning solution, and therefore only recommends rinsing with water to clean your sunglasses.