Use Acetone and Q-Tips to clean the lens and mirrors. Dip a clean Q-Tip in a fresh can or bottle of acetone..then shake the Q-Tip a couple of times briskly to expel excess acetone....kind of like you would "shake down" a medical mercury thermometer in the old days. Make a couple of passes... in the same direction..with the first Q-Tip then repeat with a New Q-Tip dipped and shaken down the same way.
This was the method we used to clean NAVY Optics..binoculars, submarine periscopes, lens, prisms and mirrors.
Be careful not to touch any Rubber, Plastic, or Painted parts with the Q-Tip. NB
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