Elias Yoder has reported:

Plain white vinegar can remove surface rust from cast iron and plain carbon steel, according to a video by Elias Yoder. He says rust often forms a film on sound metal, and an afternoon of work may restore an item that has been left unused rather than replaced.

Yoder describes a cast iron pan left on a garage shelf for two years, its cooking surface covered in orange rust. He says the pan had already cooked a thousand meals and could have cooked a thousand more. A bottle from the kitchen cupboard, he says, could have addressed the rust.

He recalls damaging his grandmother’s heavy flat griddle when he was 12. He mistook its dull grey coating for dirt and scoured it with brick dust and sand until the iron was bare. Orange rust appeared across the surface by morning. His grandmother explained that the coating had kept air away from the iron, and that the exposed metal had rusted overnight. Yoder’s lesson is that an item is not finished when it is clean, but when it is covered.

The video describes a two-second fingernail test to assess whether an item is worth restoring, and explains the difference between surface rust and pitting. Pitting means metal has been lost, Yoder says, and has different implications for a spade, a pan or an edge tool. The method does not replace missing metal, takes hours rather than minutes and is suited to iron and plain carbon steel.

Yoder recommends plain white vinegar alone, without salt. He says salt and vinegar can work on copper, but salt can start pitting iron, much as road salt speeds rust on cars. He also discusses whether to dilute the vinegar, how long it lasts, how to tell when it is spent, soaking times and a thumb test to determine when to remove an item. Leaving iron in the vinegar longer than necessary is discouraged.

For large items that will not fit in a tub, the video covers a rag-and-wrap method. It also explains that iron removed from vinegar is bare, wet and acidic, and can turn orange again within minutes. Yoder says to stop the acid first by placing the item in a basin of water with a good spoonful of baking soda stirred in. He describes the sequence as acid to remove rust, followed by alkali to stop the acid, and says not to use them both at once.

The video includes instructions for properly reseasoning a pan, including a wipe that Yoder says many people get wrong, as well as treating hand tools, garden tools and a jar of rusted bolts together. It warns against putting aluminium, galvanised steel, stainless steel, chrome, items with attached wooden handles, or anything with a spring or fine mechanism in vinegar.

The metal remains vulnerable to rust until it is covered, Yoder says. The video also presents a five-second habit intended to prevent future rust and asks viewers to comment about rusty items they have been meaning to address and whether their shop or shed is damp. Yoder says dampness can determine whether the work is needed once or yearly. He previews a future video about restoring an edge on a tool and promotes his complete Amish home-saving method, which he says teaches people to save $6,000 a year.