Any polishing compound will work to take off the haze. I've even used plain toothpaste on a damp rag and rubbed with a finger. Low voltage is a matter of chasing down loose connections, corroded crimps and wire that's too light for the current flow and distance it has to travel. Also, look very closely at your bulbs. When the filaments get old, they start to vaporize and deposit a black haze to the inside of the bulb envelope. Nothing to do there but replace the bulb.
2013 Tiffin Allegro Bus 43QGP
2011 Chevy Silverado 1500 Toad