Urban Legend:

Wash Your Pop Cans

"………..
The cans are typically stocked in warehouses and transported straight to the shops without being cleaned. A study at NYCU showed that the tops of soda cans are more contaminated than public toilets (i.e.)full of germs and bacteria. So wash them with water before putting them to the mouth to avoid any kind of fatal accident.
…………. ”

My idea to prevent this situation:
cover for the can

Also, you will see a Carlsberg can after I sent them my idea some time ago, perhaps it was only a coincidence.

My idea seems better than Carlsberg’s , paper rather than plastic.