Yup it is time to clean those RCA,s, spades, binding posts and the like.
Check your outlets and tighten up the connections and screws, if required. They loosen over time. Polish the blades on the power cords. Clean those blades on the IEC, usually the most often forgotten.
Check your speaker driver screws as well. Torque them with same pressure. Same for transformers.
Use Progold to clean and protect. Oh clean those ears as well.
charles