davidrb wrote:
You may want to discover why you are experiencing this. I see photographers constantly checking their lenses, but seldom do they need to clean them. What causes these smudges? Smudges can lead to scratches. Til you can find out what is causing this, you might try a LensPen, they are inexpensive and easy to carry.
In fact you might want to consider a filter to protect the lens, if you are having that much trouble.