Disclaimer: not a professional, just an enthusiast
From what I understand, both clay and iron remover should be done. Although they do overlap a bit on their goals, clay will remove things that aren't iron. And iron remover I think will do a better job removing specifically..... Iron lol.
If it were me, I would
1. Strip wash and rinse
2. Iron remover and rinse
3. Clay
4. Obsessively dry, including blowing out all crevices.
5. Coat
Assuming there isn't any polishing you want to do. Should be done before the coating.
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