Unless I am away, around the first of the every month, I have a ritual. That is to clean my my lenses and camera. I did not clean the sensor in the camera, unless spots are showing up on my pictures. First thing I do, I use CRC contact cleaner to clean the contacts and mounting rings on the camera and lenses with a separate Q-tip for each one. You would be surprised how much dirt and some corrosion occurs over a month. This is to make sure there is always good contact between the lens and the camera.
Next, I clean the front elements of the lenses. My procedure is first to blow crud off the lens with a
Giottos blower, then brush the lens and finally using a PecPad moistened with LenClean, starting in the center and working toward the rim clean any residue off of the lens and then polish with a microfiber cloth.
The microfiber cloths after I finish hand washed in warm water and left to wear dry, then they will be placed in a Ziploc bag.
When I am out on a shoot, I always carry a small case containing microfiber cloths, PecPad, LenClean, Q-tips and contact cleaner, so I am prepared if anything needs immediate care.