I'm attempting to clean up a heavily tarnish brass door knocker, one method Google gave from uk.d-i-y was to use ammonia solution, any suggestions where I can get this? tried the sheds etc., just get blank looks.
The second, washing soda and turkey foil method seems to be working, albeit slowly, it's bubbling away and dissolving the foil, just wondering if anyone knows what the chemistry of this method is? I have a slight concern that the gas bubbling off might be hydrogen and I'll end up demolishing the kitchen, though I suspect it's CO2, I don't fancy striking a match to find out.
MTIA