diytoolbox
Established Member
I may be mistaken but I believe you’re supposed to use washing soda not baking soda. I think you then end up with less acidity, or even a weak alkali but it is a chelating agent which causes rust particles to seperate but shouldn’t etch anything.
Or that might have been a typo and you meant to say washing soda anyway.
I’ve never tried the ‘magic mix’ - only citric acid on its own and I found things went grey.
I was not sure which soda to use for the best result. I just ended up getting baking soda. Maybe it was cheaper, and also safer for the environment and health.
I will try to get washing soda next time, and see how it comes out different.