nicolaidenmark wrote:
I'm more concerned about removing sand
Sand or dust..............never use a cloth. Blow that stuff off. Can of compressed air or a blower brush works well.
I always got rid of fingerprints as I suggested...........although they were not French Fry grease coated fingers. Anything real stubborn, a lens cleaning solution and Kodak lens cleaning disposable tissues..........sure. I think I may have used that stuff a couple/three times in 20+ years and usually after a salt spray drenching at the beach.
The least amount of anything contacting the front or rear elements of the lens the better..............I also always used a UV or Skylight filter over the front element.