Maintaining copper sink is not so easy.

Huh, I've never considered owning a copper sink. Now that I've seen this video, I'll never consider even harder owning a copper sink.

This is a crack heads wet dream

I’ve had one. Use baby oil to both clean and condition it, makes it very easy to maintain.

I like rustic look of it.

Lemon and salt clean that right up 🤷

I prefer the original patina over the pink raw copper.

Ketchup, just use ketchup. Smear it on to remove tarnish and polish the copper and then wash off the ketchup with a standard cleaner.

looks awful either way. not worth the maintenance

Cheaper/easier/better to buy the biggest bottle of cheap ketchup you can find. Wipe on thin layer, wait ten minutes, rub your scrub pad over it and...done. I've been cleaning copper bottom pots and pans this way for fifty years. The acid in the tomato sauce does the trick.

Barkeepers friend is amazing.