I shoot mine a lot and clean them about once a month. That's about 2K rounds. I pull the side plate off and lightly grease with Slide Glide from Brian Enos. Just a drop under the hammer the trigger and the rebound slide. I can really feel the difference in my highly tuned revolvers.

My Model 10 is kept clean with a little rem-oil sprayed inside and I've never taken the side plate off. It has a very smooth action direct from the factory. Nothing beats the quality of an old Smith & Wesson