Respectfully disagree here - Novus 2 is an abrasive, meant for plastics and ramps. It will wear through your playfield's protective varnish if used frequently and cause serious damage down the road. You're better off cleaning with a mild degreasing cleaner and soft cloth, followed by a coat of carnuba paste wax (never use cleaning wax).

I use a generic water-based degreasing cleaner I found at Lowes - seems to be similar to Windex, but green. Always be sure to wipe down immediately and thoroughly, because the water can damage the wood I'd left on.

Naphtha is good for ground-in hard-to-clean grime and you can use poster putty to lift out dirt in planking and fine cracks. Also: Never ever ever use Magic Eraser on a play field. It will strip the protective varnish (and the paint and the primer) right off.