Most chains come pre-lubed with grease, ready to run. Reapplying grease is next to impossible, because its too thick to get into the links. You can get around this by dissolving it in petrol and apply liberally while back pedalling. This both dissolves some of the old lube and grime, that can then be wiped with a rag, and replenishes the lubrication. This method works well for the wet and salty Scandinavian winter and is very low labour