mrv 

I think one of these threads argued for a 5% solution. I got a gallon of green stuff from Lowe's , which I figured out was a 50% solution, so I diluted appropriately using the metric system.... which is easier than oz, gal, qts, or whatever.
I soaked the Allez Castrophe' ( https://www.bikeforums.net/g/album/28780430 ) overnight after paint strip. As far as I can tell.... it didn't hurt!
But the frame was in a REALLY bad way when I got it: missing cable guide, corroded cable guides; fused stuck quill stem.
I'll see if I have any better pics to add to the album after soak. It's painted now, but not clear coated yet.

I also used an undiluted solution to short term soak (~45 minutes?) another frame. that was in bad shape (fused seatpost; incredibly stuck BB, big ding in the DT). This cheap Fix8 project I'm still working: https://www.bikeforums.net/g/album/30495164
-- I'll load more pics shortly. It's no painted Spray.Bike "Ag". Really kind of looks like the Tin Man....

Anyway, I am really hoping the oxalic acid inside the frame helps convert any unseen corrosion. I'll treat the inside of the tubes with something - FrameSaver if I can get it, otherwise PB Blaster or boiled linseed oil.

cheeers.