Deoxit makes a noticeable improvement in sonics. More clarity, less grain; subtle, but obvious gain in overall refinement. Do your interconnects also!
Take Qtips (not the plastic stick version) and pull the cotton off the ends so that the “stick” is bare, or with only the thinnest layer of cotton left. Dip or spray the ends with Deoxit, stick in the ground flanges of your interconnects’ male RCA connectors and twirl around inside. You’ll be amazed at their dark color afterwards. Then do the same for the inside of the female RCA connectors on your amp. Don’t reuse. Use clean Qtips for each connection.
You will hear the difference.