When I clean lenses, I actually wash them in a plastic jar with dish washing soap, and using my fingers underwater very gently to clean the surfaces. I then rinse in regular cold water, and then again in distilled water and pat dry.

I then reinstall them in the lens holders.

Some times when I don't want to remove the lens I use denatured alcohol. along with some frosted breath, and a terry cloth rag.

If you have fungus on a lens...use a 50/50 mix of hydrogen peroxide and ammonia. It dissolves the fungus. Then wash in cool water, followed by a dish washing soap cleaning and then the distilled water bath.