The next time you buy a can of juice or cold drink, observe the top part. Don’t just open it and start drinking right away.
Cans are usually stored in warehouses and unhygienic environments, and then sold right off the counter. From what I have observed, most cans are unclean.
I generally wash a can’s top part before I drink from one. But you can always use a straw otherwise.
Barnadhya Rwitam 
I often forget until I have drunk a few gulps!
Haha…hope you will remember from next time onwards 😀
I don’t worry too much if it is out of the box and looks clean!
As a mum, I always wipe and sanitize packs before we use them. Wipe the can and the straw too! 🙂
That’s really a healthy practice you are following, Chetna 👍