On 09/08/2018 04:58 PM, Frank wrote:
On 9/8/2018 2:30 PM, Andy wrote:
rust cure by tri-win

Safety data sheet shows mainly 28% phosphoric acid. Look for something
with similar label.

http://www.rust-cure.com/safety-data-sheet

You can find phosphoric acid in the masonry section of places like Home
Depot. It's used for etching concrete.

It has the advantage of attacking rust and not the base metal. It also
leaves a phosphate film on the material. Hydrochloric is more aggressive
and the surface tends to rust as soon as it dries out.