[Bob Andersen]

Evaporust does not remove cadmium plating. It's similar to molasses (yes, you can remove rust with molasses )and uses a process called chelation which only effect iron oxide. No acids or other harsh chemicals. You likely had a layer of oxidized cadmium or some coating like varnish that came off.

On the other hand, Naval jelly is an acid and can react with brass, copper etc. so be careful what you get it on.