How to clean a SLR Camera Lens!!
Step 1: Papers
Lens cleaning paper- like $1-2
Step 2: Remove Filters and Shades
Remove any filters and shades
Step 3: Removing the Lens
Take off the lens carefully and set the body of the camera aside.
Step 4: Removing Dust
Use it loosely wadded to brush dust from a lens
Step 5: Remove Finger Prints
Use the paper sheet wise to wipe front and back of the lens gently. Breath on the lens to slightly moisten it and wipe in a circular motion.
Step 6: Reassemble
Reassemble the cameras lens to the body
Also you can use a drop of lens cleaner. I didn't because i don't have any cleaner but breathing on the lens works fine.
Take care of your lens!! Cleaner lenses make cleaner pictures!