For general cleaning, we use Armorall and a toothbrush on the cameras and lenses we take in on trade, been doing this for years, and it really makes the cameras, etc., look nice. Apply with a brush let it sit for a minute or two to loosen the sticky stuff, then brush to remove the loosened material. Wipe it down with an old towel or cloth. We then clean the VF and mirror with a cotton swab with lens cleaner, and finally remove the last of the smeary stuff (a residual film, really) with a microfiber cloth on a Q-tip. This really makes the glass look great.
Same thing with lenses. And as always , don't overdo the Armorall, ending up with a light film works best, I just pour a small puddle on the glass counter, dip the bristles and have at it. This method works very well with white numbers on the lenses which have accumulated a film of dirt.