Discovered this game changing hack a few weeks ago. My stainless steel drink containers always seem to become badly stained from all the tea and coffee I drink. Well thanks to Google, this is not the case anymore.
Start by boiling the hot water.
After the water is boiled fill up the cup to just below the rim and let it sit for 15 to 20 minutes. Just enough time to hop in the the shower and change pj’s bahahaha.