I do it every other ride. May be overkill for most, but I live in a place where there is tons of fine sand everywhere. There is no place where sand doesn't get into here. You get a colonoscopy, and I am sure they'll find sand there too. I simply take a rag and run the chain by it. Then, I take some finish line DRY teflon lube and squirt as the chain runs. Finally, take a rag and run it by the chain again to take the excess. Takes < 1 min to do.
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Arguing with ignorant people is an exercise in futility. They will bring you down to their level and once there they will beat you with their overwhelming experience.