I've used caustic soda on an old Ribble 653 frame and it certainly works if your mixture is strong enough - only takes a couple of hours. Big issue is the paint work - it's almost unavoidable getting it everywhere. Here are some of my pics:
@TheHighlander started
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I've used caustic soda on an old Ribble 653 frame and it certainly works if your mixture is strong enough - only takes a couple of hours. Big issue is the paint work - it's almost unavoidable getting it everywhere. Here are some of my pics: