/biz/ - Business & Finance

Bought these silver coins while on vacation last week. Don't care if they're meme coins, they were cheap and I can't buy them here. The bar on the right was a gift from a friend.

So how do I clean them? The coins are dirty, but still shiny, you can see the reflection of the phone in them. The middle bottom Canadian coin has a black mark, something like a burn mark? The bar is clean, but not so shiny anymore.

Google tells me I need to use baking soda, but English isn't my native language, so I'm not sure what this baking soda even is, lol. I do have a container of what's apparently "pure NaHCO3" though, which is something like baking soda I guess? Can I use that?