When the vinegar and naval jelly run out, grab a can of Coke, the soda. Works well to remove rust. The only down-side is you have to make sure you wash it off thoroughly.
I used to use Coke with wadded-up aluminum foil when I was a young kid to remove rust from my bike. Check this out. Folks still do that:
https://snapguide.com/guides/remove-...ith-coca-cola/
-