hifi engine

Cleaning A Marantz Amp

I have a recently purcashed a old Marantz 1060 Amp and from the looks of it the oustside it has gone years without being cleaned. I have been looking online to try and find ways to clean off all the built up with no succes. What I can use to clean the faceplate that will not ruin the plastic, markings or metal?

Any suggestions would be greatly appreciated.