cross-posted from: https://lemmy.ca/post/54746362
I was burning a cone incense and left it on the sink, and this stain won't come off. I tried baking soda, water, vinegar, hydrogen peroxide. I tried letting them sit for multiple interations, and it made no difference.
Most people can tell by touch. Knock on it and you'll feel and hear if its porcelain or enameled steel/iron like most are. If its dead sounding, like knocking on a coffee cup its porcelaine, if it rings a bit, enameled steel.
As long as its one of those two, you can try scrubbing 000 or 0000 steel wool. If its soft plastic, don't as you'll scratch it.