Clean cans / cans

people usually clean the top of a pop can and some other parts they possibly will touch with tissue before drinking because there are bacteria and dust on the can.this way might be a feasible one but they can't make sure the cans are thoroughly cleaned and it's really an inconvenient matter to use tissue every time before drinking.as to this problem,we made a small change on pop cans---pasting a transparent plastic protecting film on the upper part of them to cover all the parts.when pulling the ring ,the film is also uncovered so that we can avoid the harmful bacteria.besides,the design will not greatly add to the cost.