Why treat lifts like bins?

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Just got in to find two Capri suns empty and left in the lift as rubbish… That is absolutely disgusting. Please pick up your rubbish. You wouldn’t do it at home so why do it in the communal parts of the building!
We don’t pay for cleaners to pick up rubbish after you. If it was kids, are their parents teaching them any manners and respect towards others???