Anybody Tried Kochchemie "Reactive Rust Remover" on Their Rifles/Equipment?

Just watched a YT vid showing how this stuff works on car rust--pretty amazing. It's pH neutral and supposedly safe on "painted surfaces." This seems to be one of the go-to rust removers for car detailers. Of course our stuff is blued, or parked, or whatever, so don't want to be first to try it on an otherwise nice Enfield (LOL).

If you've used it, how does it compare to EvapoRust and sodium citrate rust removers?

You Tube electrolysis. Water + Washing Soda + battery charger = neutralized rust and no damage to bluing.

They certainly seem to have a full line of products. Turns rust black like acetic acid (vinegar) and that takes off blue as well as it does rust, so no idea if this stuff is suitable for blued surfaces.