Derusting steel

[Uncle Buck]

Over the last couple of years I have restored many hand tools and devices and hand tools. Most things I restore has gone through an Evaporust bath as part of this process.
Recently I took on my most challenging heavily rusted piece yet, a cast iron tea/water pot.
Due to the quantity of soaking solution needed to totally immerse the pot i chose to use household vinegar (approximately 5%) after much research i following the advice given by most relative to the topic. I used 2 gallons of 5% vinegar and diluted it with one gallon of water. (Dilution with 2 gallons of water is what is suggested by most sources i found) i used 1 gallon due to extreme internal corrosion of the pot.
After 4-5 days soaking the exterior of the pot cleaned up like new with no evidence of damage to the exterior of the pot even after it's long soak.
The inside remains heavily corroded and i am contemplating switching gears and using 30% cleaning vinegar for the inside surface of the pot.
As many of you likely know, 30% vinegar is 6 times stronger than regular 5% vinegar. 30% vinegar is much more hazardous to work with compared by some to muratic acid.
Serious precautions must be taken to use 30% vinegar such as PPE and a number of other precautions.
I have strong reservations about switching to 30% vinegar and so far have  held off doing so due to everything I have read so far.

So, for my question. Has anyone here ever used 30% vinegar to de-rust steel and would you please share your thoughts relative to this subject.

My current thoughts are I could realize better results switching to electrolysis  to clean the pot. That said I have reservations about going that route too.