Mild soap on the faceplate, and electronics cleaner/lube spray on the inside. Sold by Amazon. I like the older Marantz products
Firesign Theater: "Heavy on the 30 weight, Mom."
2013 Honda Accord LX, 61K, 2nd owner
2007 Honda Ridgeline RTS, 95K, 1st owner
2007 Infiniti M35, 115K, 1st owner