What is the proper way to clean the objective lens?

First, use a blower to blow away any dust or dirt on the lens without allowing the blower to touch it. Then, slightly dampen a lens cleaning paper with lens cleaner and lightly wipe the objective lens, starting from the center and wiping in spirals toward the circumference. Continue changing the lens cleaning paper and wiping until the dirt is gone and there are no streaks. Do not use alcohol, eyeglass cleaner, or silicone-coated paper.