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Nitromors and a brush, or does it need dipping in something more potent?
and some wire wool, rubber gloves & goggles
what is it made of and any chance the welds (if metal) have been smoothed with filler?
Anything other than 100% metal and I would avoid any chemical stripping.
I discovered a fairly simple approach.
Screwfix paint stripper
http://www.screwfix.com/p/no-nonsense-paint-varnish-stripper-500ml/17091
Slop it on, leave for a couple hours, slop it on a hit more, leave another couple hours, slop some more on and leave it overnight.
Next day blast it with a pressure washer and hey presto 'paint be gone'!
Perhaps there might be some ecological issues here but hey I drive a diesel.
Good luck.
Ps I've tried other methods and this has been easiest and most successful.
How much of that Screwfix stuff for one frame?
About half a bottle
Used a hot air gun once. Peeled off in big lumps. Pretty easy. Probably depends on the paint though.
Will try that Screwfix stuff. Thanks for the tip.