Apparently there are lots of homemade recipes for copper cleaners out there. I did a quick Google and found one that uses flour, salt, powdered detergent, white vinegar, and lemon juice. Then I found another that uses taco sauceolivierco wrote:I have just received a copper canister.
It is actually a little darker as in this picture.
Any advice for "cleaning" it?

If that seems too weird, I know there are plenty of commercial cream cleaners on the market. I've no idea what's available in France, but here I use Twinkle Copper Cleaner:

That's if you want the copper to be shiny and bright. Some people like a bit of patina.
If you're happy with the way it looks now, maybe just give it a wash in soapy water, then rinse in very hot water and leave it out to dry thoroughly? That should get rid of any dirt.