The weird and wonderful cleaning agents and solutions for restoring and preserving ethnographic arms and Armour is a subject perhaps best placed in the margins of Forum activity ...and I respectfully request its placement in Miscellaneous ( Ethnographic Miscellania ) for concise referencing by members..
I suspect this form of aggressive rust remover will tear a good sword apart removing patina and sword blade at the same time. I find it reasonable to know the less dangerous chemicals and apply them first such as light cleaning with warm soapy water...then step up to cold coke cola... but to check every 8 to12 hours removing with soapy water and rinse at the first sign of action. The juices come next and any fruit juice will do ...Then comes the paste with Tomato being quite good...again check every 12 hours... etc The worst stuff is acid... and even worse than that hot solutions ...
Hot acid will destroy your item if left too long ...and check every half minute ... its that fast...Dont use it is my advice. I put this de corrosion stuff in the same category...
The action suggested at #22 by Josh Stout is excellent...