Soft toothbrush and Windex, followed by shoe polish (followed by a shine sponge - or Scuff Guard - IF the original finish was supposed to be high gloss). The coatings back then were soft and were not fused to the glass (they hadn't yet learned to bake them) and the ammonia may eat up your lens coating. This especially applies to lens coatings made prior to the mid 70s and to naturally bloomed lenses. NEVER allow any lens cleaner or glass cleaner containing ammonia (like Windex) to come into contact with the lens. I use Windex on a soft bristled toothbrush.
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