I never manage a shopping mall before but I suppose it is the same as managing a CCTV system. A good CCTV system should be your first line of protection, that's to prevent crime from happening.
Back to the mall, the problem may not be the tenants or the shoppers but trash can. The manager should find out if the mall had enough trash can and if they were strategically located.
Like a good CCTV system to prevent crime, a good "Trash Can System" is their first line of protection to prevent people from littering.
Prevention is always better than cure.
Make sure you wear your "helmet" when you hit the road... well, I suppose any trash can is better than no trash can.
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