I was searching for methods of chrome cleaning that won't marr the surface and came across some discussions involving aluminum foil and water. It sounded reasonable. The aluminum is soft and won't scratch steel or chrome. The water provides slight Aluminum Oxide to build up, which provides the slight chemical reaction and mild abrasive action.
Mothers polish is just too abrasive.
I tried it on an inconspicuous spot and was pleased with the results. Working upside-down the water tended to run off, so I spit on it. That worked even better than water.
The photo doesn't do it justice, but it looks so much better maintaining a level of patina without the rust layer.