IME, when I’ve been doing some dusty and dirty field work and carry my 581. I typically keep a can of computer duster when I’m on the road and depending on how bad the environment is. I will typically use that computer duster about once every two weeks. As previously stated adding more lubricant can actually gum it up. A good spray off of internals, then side plate back on, maybe a small drop of clp if warranted. FWIW, I typically carry open in the field with a good leather holster that covers everything up to the grip and hammer.