need things:-

Lens cloth

Liquid lens cleaner

Soft brush

Cotton swabs

1. Step OneWith a soft brush, such as a clean makeup brush, carefully brush away any dust and dirt particles that may be on your camera lens. Do not skip this step as a small bit of sand or dirt left behind could scratch your lens in the next steps.

2. Step TwoTake a cotton swab and lightly moisten it with your lens cleaning fluid. Carefully swab around the inside edges of your lens.

3. Step ThreePut a few drops of cleaning solution on a lens cloth. Be sure to use a cloth that is specifically made for lenses or you will run the risk of scratching the lens. Carefully polish the lens with the moistened cloth.

4. Step Five Repeat these steps on any lens filters you may have.

5. Step FourWith a dry portion of the lens cloth, buff the lens in a circular motion to dry away any remaining cleaning solution.