Top tips to restore and protect parts from corrosion. Rust begone and stay gone for shafts and parts

This video details a lot of learning that I have applied to my current workshop after nearly a decade of doing this sort of stuff.
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[@JonDingle]

Buy a tub of phosphoric acid which is generally more concentrated then "rust removing agents" and very much cheaper. Dillute with water or use neat, it's up to you. Neat it takes 10-30mins depending on how strong the solution is. Then, immediately rinse with water, then quickly dry most of the water off and then immediately spray with kerosene. Save a ton of money on bought in products and its fast.
The rust on your cleaned parts was flash rust not "remaining rust" but new rust. As for the bearing seal, its not removable as such, you should replace the bearing with a new one ideally.
You can put carbon black on by heating the components to high temperature (Not red hot) and then dip them in cooking oil and do this several times until the desired finish is achieved. I have done this and it does take time but you could always use an old deep fat fryer and its basket to do multiple items.

[@carburist]

All valid points! The thing with those bearings is that they are “captive” so impossible to take out unless I break the end of the shaft off