Cheapest option is a purchase of this and a couple of hours of your time...
https://www.amazon.co.uk/Starchem-Synstryp-Paint-Stripper-Litres/dp/B00A7RMPGS
Put it on with a brush. Wait. Wipe it off with a cloth. Done.
Would this be the best way to do a steel frame too?
Sure. It'll eat the paint off. With steel though you've obviously got to worry about rusting. If you're going to use this process on steel, be prepared to use abrasives on the metal and then prime it as soon as possible.
And yeah... like Euan says... wear a HAZMAT suit.
[edited for spelling]
@Jameshk started
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Cheapest option is a purchase of this and a couple of hours of your time...
https://www.amazon.co.uk/Starchem-Synstryp-Paint-Stripper-Litres/dp/B00A7RMPGS
Put it on with a brush.
Wait.
Wipe it off with a cloth.
Done.