Should I tell my boss that she needs to recycle her cans, because they are unhygienic?

Well, she's not my boss, but we have a contract with her. I work for a commercial cleaning company. At the building I clean, my boss drinks a lot of redbulls. She puts them in a bag, and stacks them in the break room. They've been there for about a year. Should I tell her that she should just recycle them? I don't want people getting sick.

Should I tell my boss that she needs to recycle her cans, because they are unhygienic?
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