I use a soft cheap toothbrush, some Armor All, Windex and some FW1 Racing Formula Wash & Wax. I use FW1 on everything but any vinyl art.
I first mask off the buttons (if the machine is assembled), spray on Windex and wipe off with a microfiber cloth and repeat until all the dirt's gone.
Then I apply a bit of Armor All (optional) and spread it evenly to give it a bit of a shine.
And then I evenly cover the CP with some Fw1 Racing Formula and immediately wipe most off with a terry cloth towel, wait 5-15 seconds until it begins to haze, and wipe it all off with a microfiber towel.
Warning: Do not use FW1 on Vinyl!!! It will smudge and lose color!