Reddit mentions of Goddard's Silver Care Liquid Dip - 10 oz.

Pure silver wouldn’t “rust” per se, but electroplated nickel steel (EPNS) items could.

So, we have display items from the 1800s at work, proper silver that has been hallmarked.

If there is a considerable amount of issues with an item, a soft toothbrush and a bit of elbow grease dipped in
silver polish cream will remove most of the patina (we like our silver shiny). To remove the additional polish that sticks into the nooks and crannies (the excess polish dries dull pink to be easily seen), dip the toothbrush into
silver dip
(different tubs for display and food service items!) and scrub off the dried up polish. Buff with a soft cloth (we use ripped up old cotton bed sheets as rags).

The use of gloves and a face mask is always greatly encouraged, especially the latter when you’re removing the dried polish, becomes a fine dust.

Food service items, we’ll silver dip in a tub (again different bottles for food and display), then immediately wash in running water. We may use a soft sponge to scrub it a bit. If there is a spec of rust through the EPNS, we’ll clean that off with a
Brillo Pad
very lightly; you will cause some fine micro scratches to the plating around the rust, but it’ll just remove a fine layer.

NOT TO BE USED ON DISPLAY ITEMS!

I’ve had a group of over zealous lads come through before and pour a bit of silver dip into a silver ice bucket from 1870s before, then leave it in the Silver Store. Since it wasn’t a piece that was regularly rotated for display, we didn’t realise that it was full with dip for the better part of a few months. Couldn’t smell it either, since the store smelled of polish. When we did find it, it was as expected, but with crystals everywhere. Turned a sludgy black too. The acid in the dip actually burned through the silver, so that was totally lost.

To remove the crystals, a screwdriver, hot water, and a few hours of chipping and scrubbing may have been involved. Externally the ice bucket is still display worthy, just don’t look inside.

Once the silver plate is lost, it’ll be just a base brassy yellow colour in that spot. I’ll try to find an example at work later.

We regularly dip our EPNS cutlery at least once or twice a week; after through washing (especially if egg yolk has been involved), open a jar and just dip the fork tines in, less than 2 seconds is enough, if you want to swirl it around you can too, until the tarnish is removed, then wash in running water.