On certain S&W revolvers I shoot a lot, I will remove all the internals and put them in the ultrasonic cleaner. Dry them all with an air compressor that has a water seperator and lube em up.
I also install Wolfe Springs in all my revolvers. I use an India stone to hone the contact points especially the sear and trigger. Smooths them right out. Some people can not believe I do my own trigger jobs. They really are not that hard.
If you use an India stone or the like, be very careful. You are not removing metal just honing it very slightly.