What does the lease say? Absent a specific provision, it is usually assumed that a tenant will leave the premises as found. If the tenant does not, they are responsible for the clean-up
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Were you the Lessor and subleased it to another. If so, you have to clean up the mess depending on your own lease. You should have gotten a security deposit and charged that for the cleanup. Try to work it out with them and if that fails, consult a local attorney for some advice on your paperwork.