I know this might seem like an odd question, but bear with me here, this is something that I've been meaning to ask for a while now. I realize that cans in the USA often come in 4-packs with a plastic holder that shields the top of the can and for the longest time I always thought how silly this was and couldn't figure out the point... until I did. However, it's still possible to buy single cans in the USA, so I feel like this question is still valid. A little backstory here: A while ago I ordered some cans online and noticed one can being visibly stained at the top, presumeably from some spillage. So I took a wet wipe to clean it up and then, just on impulse cleaned out the cans that looked fine as well, which left the wet wipe visibly stained. I'm specifically talking about the little groove that runs around the top of the can. Even if I'm not drinking from the can directly, the beer still pools in that groove when pouring and the thought of it running through all that gunk that I'm sometimes picking up from perfectly clean looking cans when cleaning is frankly disgusting. Case in point, here's the wet wipe I used to clean today's haul. I do use kitchen roll to wipe away residue from the wet wipes afterwards as well, by the way.